ARIA2C(1)

NAME
aria2c - The ultra fast download utility

SYNOPSIS

aria2c [<OPTIONS>] [<URI>|<MAGNET>|<TORRENT_FILE>|<METALINK_FILE>] ...

DESCRIPTION

aria2 is a utility for downloading files. The supported protocols are HTTP(S), FTP, BitTorrent, and Metalink. aria2 can download a file from multiple sources/protocols and tries to utilize your maximum download bandwidth. It supports downloading a file from HTTP(S)/FTP and BitTorrent at the same time, while the data downloaded from HTTP(S)/FTP is uploaded to the BitTorrent swarm. Using Metalink's chunk checksums, aria2 automatically validates chunks of data while downloading a file like BitTorrent.

OPTIONS

  Basic Options

-d, --dir=<DIR>
    The directory to store the downloaded file.

-i, --input-file=<FILE>
    Downloads URIs found in FILE. You can specify multiple URIs for a single entity: separate URIs on a single line using the TAB character. Reads input from stdin when - is specified. Additionally, options can be specified after each line of URI. This optional line must start with one or more white spaces and have one option per single line. See Input File subsection for details. See also --deferred-input option.

-l, --log=<LOG>
    The file name of the log file. If - is specified, log is written to stdout. If empty string("") is specified, log is not written to file.

-j, --max-concurrent-downloads=<N>
    Set maximum number of parallel downloads for every static (HTTP/FTP) URI, torrent and metalink. See also --split option. Default: 5

-V, --check-integrity[=true|false]
    Check file integrity by validating piece hashes or a hash of entire file. This option has effect only in BitTorrent, Metalink downloads with checksums or HTTP(S)/FTP downloads with --checksum option. If piece hashes are provided, this option can detect damaged portions of a file and re-download them. If a hash of entire file is provided, hash check is only done when file has been already download. This is determined by file length. If hash check fails, file is re-downloaded from scratch. If both piece hashes and a hash of entire file are provided, only piece hashes are used. Default: false

-c, --continue[=true|false]
    Continue downloading a partially downloaded file. Use this option to resume a download started by a web browser or another program which downloads files sequentially from the beginning. Currently this option is only applicable to HTTP(S)/FTP downloads.

-h, --help[=<TAG>|<KEYWORD>]
    The help messages are classified with tags. A tag starts with #. For example, type --help=#http to get the usage for the options tagged with #http. If non-tag word is given, print the usage for the options whose name includes that word. Available Values: #basic, #advanced, #http, #https, #ftp, #metalink, #bittorrent, #cookie, #hook, #file, #rpc, #checksum, #experimental, #deprecated, #help, #all Default: #basic

  HTTP/FTP Options

--all-proxy=<PROXY>
    Use this proxy server for all protocols. To erase previously defined proxy, use "". You can override this setting and specify a proxy server for a particular protocol using --http-proxy, --https-proxy and --ftp-proxy options. This affects all URIs. The format of PROXY is [http://][USER:PASSWORD@]HOST[:PORT]. See also ENVIRONMENT section.

Note
    If user and password are embedded in proxy URI and they are also specified by --{http,https,ftp,all}-proxy-{user,passwd} options, those appeared later have precedence. For example, you have http-proxy-user=myname, http-proxy-passwd=mypass in aria2.conf and you specify --http-proxy="http://proxy" in command-line, then you get HTTP proxy http://proxy with user myname and password mypass.

    Another example: if you specified in command-line --http-proxy="http://user:pass@proxy" --http-proxy-user="myname" --http-proxy-passwd="mypass", then you will get HTTP proxy http://proxy with user myname and password mypass.

    One more example: if you specified in command-line --http-proxy-user="myname" --http-proxy-passwd="mypass" --http-proxy="http://user:pass@proxy", then you get HTTP proxy http://proxy with user user and password pass.

--all-proxy-passwd=<PASSWD>
    Set password for --all-proxy option.

--all-proxy-user=<USER>
    Set user for --all-proxy option.

--checksum=<TYPE>=<DIGEST>
    Set checksum. TYPE is hash type. The supported hash type is listed in Hash Algorithms in aria2c -v. DIGEST is hex digest. For example, setting sha-1 digest looks like this: sha-1=0192ba11326fe2298c8cb4de616f4d4140213838 This option applies only to HTTP(S)/FTP downloads.

--connect-timeout=<SEC>
    Set the connect timeout in seconds to establish connection to HTTP/FTP/proxy server. After the connection is established, this option makes no effect and --timeout option is used instead. Default: 60

--dry-run[=true|false]
    If true is given, aria2 just checks whether the remote file is available and doesn't download data. This option has effect on HTTP/FTP download. BitTorrent downloads are canceled if true is specified. Default: false

--lowest-speed-limit=<SPEED>
    Close connection if download speed is lower than or equal to this value(bytes per sec). 0 means aria2 does not have a lowest speed limit. You can append K or M (1K = 1024, 1M = 1024K). This option does not affect BitTorrent downloads. Default: 0

-x, --max-connection-per-server=<NUM>
    The maximum number of connections to one server for each download. Default: 1

--max-file-not-found=<NUM>
    If aria2 receives "file not found" status from the remote HTTP/FTP servers NUM times without getting a single byte, then force the download to fail. Specify 0 to disable this option. This options is effective only when using HTTP/FTP servers. Default: 0

-m, --max-tries=<N>
    Set number of tries. 0 means unlimited. See also --retry-wait. Default: 5

-k, --min-split-size=<SIZE>
    aria2 does not split less than 2*SIZE byte range. For example, let's consider downloading 20MiB file. If SIZE is 10M, aria2 can split file into 2 range [0-10MiB) and [10MiB-20MiB) and download it using 2 sources(if --split >= 2, of course). If SIZE is 15M, since 2*15M > 20MiB, aria2 does not split file and download it using 1 source. You can append K or M (1K = 1024, 1M = 1024K). Possible Values: 1M -1024M Default: 20M

-n, --no-netrc[=true|false]
    Disables netrc support. netrc support is enabled by default.

Note
    netrc file is only read at the startup if --no-netrc is false. So if --no-netrc is true at the startup, no netrc is available throughout the session. You cannot get netrc enabled even if you send --no-netrc=false using aria2.changeGlobalOption().

--no-proxy=<DOMAINS>
    Specify comma separated hostnames, domains and network address with or without CIDR block where proxy should not be used.

Note
    For network address with CIDR block, both IPv4 and IPv6 addresses work. Current implementation does not resolve hostname in URI to compare network address specified in --no-proxy. So it is only effecive if URI has numeric IP addresses.

-o, --out=<FILE>
    The file name of the downloaded file. When --force-sequential option is used, this option is ignored.

Note
    In Metalink or BitTorrent download you cannot specify file name. The file name specified here is only used when the URIs fed to aria2 are done by command line without --input-file, --force-sequential option. For example:

    $ aria2c -o myfile.zip "http://mirror1/file.zip" "http://mirror2/file.zip"

--proxy-method=<METHOD>
    Set the method to use in proxy request. METHOD is either get or tunnel. HTTPS downloads always use tunnel regardless of this option. Default: get

-R, --remote-time[=true|false]
    Retrieve timestamp of the remote file from the remote HTTP/FTP server and if it is available, apply it to the local file. Default: false

--reuse-uri[=true|false]
    Reuse already used URIs if no unused URIs are left. Default: true

--retry-wait=<SEC>
    Set the seconds to wait between retries. With SEC > 0, aria2 will retry download when the HTTP server returns 503 response. Default: 0

--server-stat-of=<FILE>
    Specify the filename to which performance profile of the servers is saved. You can load saved data using --server-stat-if option. See Server Performance Profile subsection below for file format.

--server-stat-if=<FILE>
    Specify the filename to load performance profile of the servers. The loaded data will be used in some URI selector such as feedback. See also --uri-selector option. See Server Performance Profile subsection below for file format.

--server-stat-timeout=<SEC>
    Specifies timeout in seconds to invalidate performance profile of the servers since the last contact to them. Default: 86400 (24hours)

-s, --split=<N>
    Download a file using N connections. If more than N URIs are given, first N URIs are used and remaining URIs are used for backup. If less than N URIs are given, those URIs are used more than once so that N connections total are made simultaneously. The number of connections to the same host is restricted by --max-connection-per-server option. See also --min-split-size option. Default: 5

Note
    Some Metalinks regulate the number of servers to connect. aria2 strictly respects them. This means that if Metalink defines the maxconnections attribute lower than N, then aria2 uses the value of maxconnections attribute instead of N.

--stream-piece-selector=<SELECTOR>
    Specify piece selection algorithm used in HTTP/FTP download. Piece means fixed length segment which is downloaded in parallel in segmented download. If default is given, aria2 selects piece so that it reduces the number of establishing connection. This is reasonable default behaviour because establishing connection is an expensive operation. If inorder is given, aria2 selects piece which has minimum index. Index=0 means first of the file. This will be useful to view movie while downloading it. --enable-http-pipelining option may be useful to reduce reconnection overhead. Please note that aria2 honors --min-split-size option, so it will be necessary to specify a reasonable value to --min-split-size option. If geom is given, at the beginning aria2 selects piece which has minimum index like inorder, but it exponentially increasingly keeps space from previously selected piece. This will reduce the number of establishing connection and at the same time it will download the beginning part of the file first. This will be useful to view movie while downloading it. Default: default

-t, --timeout=<SEC>
    Set timeout in seconds. Default: 60

--uri-selector=<SELECTOR>
    Specify URI selection algorithm. The possible values are inorder, feedback and adaptive. If inorder is given, URI is tried in the order appeared in the URI list. If feedback is given, aria2 uses download speed observed in the previous downloads and choose fastest server in the URI list. This also effectively skips dead mirrors. The observed download speed is a part of performance profile of servers mentioned in --server-stat-of and --server-stat-if options. If adaptive is given, selects one of the best mirrors for the first and reserved connections. For supplementary ones, it returns mirrors which has not been tested yet, and if each of them has already been tested, returns mirrors which has to be tested again. Otherwise, it doesn't select anymore mirrors. Like feedback, it uses a performance profile of servers. Default: feedback

  HTTP Specific Options

--ca-certificate=<FILE>
    Use the certificate authorities in FILE to verify the peers. The certificate file must be in PEM format and can contain multiple CA certificates. Use --check-certificate option to enable verification.

Note
    If you build with OpenSSL or the recent version of GnuTLS which has gnutls_certificate_set_x509_system_trust() function and the library is properly configured to locate the system-wide CA certificates store, aria2 will automatically load those certificates at the startup.

--certificate=<FILE>
    Use the client certificate in FILE. The certificate must be in PEM format. You may use --private-key option to specify the private key.

--check-certificate[=true|false]
    Verify the peer using certificates specified in --ca-certificate option. Default: true

--http-accept-gzip[=true|false]
    Send Accept: deflate, gzip request header and inflate response if remote server responds with Content-Encoding: gzip or Content-Encoding: deflate. Default: false

Note
    Some server responds with Content-Encoding: gzip for files which itself is gzipped file. aria2 inflates them anyway because of the response header.

--http-auth-challenge[=true|false]
    Send HTTP authorization header only when it is requested by the server. If false is set, then authorization header is always sent to the server. There is an exception: if username and password are embedded in URI, authorization header is always sent to the server regardless of this option. Default: false

--http-no-cache[=true|false]
    Send Cache-Control: no-cache and Pragma: no-cache header to avoid cached content. If false is given, these headers are not sent and you can add Cache-Control header with a directive you like using --header option. Default: true

--http-user=<USER>
    Set HTTP user. This affects all URIs.

--http-passwd=<PASSWD>
    Set HTTP password. This affects all URIs.

--http-proxy=<PROXY>
    Use this proxy server for HTTP. To erase previously defined proxy, use "". See also --all-proxy option. This affects all URIs. The format of PROXY is [http://][USER:PASSWORD@]HOST[:PORT]

--http-proxy-passwd=<PASSWD>
    Set password for --http-proxy option.

--http-proxy-user=<USER>
    Set user for --http-proxy option.

--https-proxy=<PROXY>
    Use this proxy server for HTTPS. To erase previously defined proxy, use "". See also --all-proxy option. This affects all URIs. The format of PROXY is [http://][USER:PASSWORD@]HOST[:PORT]

--https-proxy-passwd=<PASSWD>
    Set password for --https-proxy option.

--https-proxy-user=<USER>
    Set user for --https-proxy option.

--private-key=<FILE>
    Use the private key in FILE. The private key must be decrypted and in PEM format. The behavior when encrypted one is given is undefined. See also --certificate option.

--referer=<REFERER>
    Set Referer. This affects all URIs.

--enable-http-keep-alive[=true|false]
    Enable HTTP/1.1 persistent connection. Default: true

--enable-http-pipelining[=true|false]
    Enable HTTP/1.1 pipelining. Default: false

Note
    In performance perspective, there is usually no advantage to enable this option.

--header=<HEADER>
    Append HEADER to HTTP request header. You can use this option repeatedly to specify more than one header:

    $ aria2c --header="X-A: b78" --header="X-B: 9J1" "http://host/file"

--load-cookies=<FILE>
    Load Cookies from FILE using the Firefox3 format (SQLite3), Chromium/Google Chrome (SQLite3) and the Mozilla/Firefox(1.x/2.x)/Netscape format.

Note
    If aria2 is built without libsqlite3, then it doesn't support Firefox3 and Chromium/Google Chrome cookie format.

--save-cookies=<FILE>
    Save Cookies to FILE in Mozilla/Firefox(1.x/2.x)/ Netscape format. If FILE already exists, it is overwritten. Session Cookies are also saved and their expiry values are treated as 0. Possible Values: /path/to/file

--use-head[=true|false]
    Use HEAD method for the first request to the HTTP server. Default: false

-U, --user-agent=<USER_AGENT>
    Set user agent for HTTP(S) downloads. Default: aria2/$VERSION, $VERSION is replaced by package version.

  FTP Specific Options

--ftp-user=<USER>
    Set FTP user. This affects all URIs. Default: anonymous

--ftp-passwd=<PASSWD>
    Set FTP password. This affects all URIs. If user name is embedded but password is missing in URI, aria2 tries to resolve password using .netrc. If password is found in .netrc, then use it as password. If not, use the password specified in this option. Default: ARIA2USER@

-p, --ftp-pasv[=true|false]
    Use the passive mode in FTP. If false is given, the active mode will be used. Default: true

--ftp-proxy=<PROXY>
    Use this proxy server for FTP. To erase previously defined proxy, use "". See also --all-proxy option. This affects all URIs. The format of PROXY is [http://][USER:PASSWORD@]HOST[:PORT]

--ftp-proxy-passwd=<PASSWD>
    Set password for --ftp-proxy option.

--ftp-proxy-user=<USER>
    Set user for --ftp-proxy option.

--ftp-type=<TYPE>
    Set FTP transfer type. TYPE is either binary or ascii. Default: binary

--ftp-reuse-connection[=true|false]
    Reuse connection in FTP. Default: true

  BitTorrent/Metalink Options

--select-file=<INDEX>...
    Set file to download by specifying its index. You can find the file index using the --show-files option. Multiple indexes can be specified by using ,, for example: 3,6. You can also use - to specify a range: 1-5. , and - can be used together: 1-5,8,9. When used with the -M option, index may vary depending on the query (see --metalink-* options).

Note
    In multi file torrent, the adjacent files specified by this option may also be downloaded. This is by design, not a bug. A single piece may include several files or part of files, and aria2 writes the piece to the appropriate files.

-S, --show-files[=true|false]
    Print file listing of ".torrent", ".meta4" and ".metalink" file and exit. In case of ".torrent" file, additional information (infohash, piece length, etc) is also printed.

  BitTorrent Specific Options

--bt-enable-lpd[=true|false]
    Enable Local Peer Discovery. If a private flag is set in a torrent, aria2 doesn't use this feature for that download even if true is given. Default: false

--bt-exclude-tracker=<URI>[,...]
    Comma separated list of BitTorrent tracker's announce URI to remove. You can use special value * which matches all URIs, thus removes all announce URIs. When specifying * in shell command-line, don't forget to escape or quote it. See also --bt-tracker option.

--bt-external-ip=<IPADDRESS>
    Specify the external IP address to report to a BitTorrent tracker. Although this function is named external, it can accept any kind of IP addresses. IPADDRESS must be a numeric IP address.

--bt-hash-check-seed[=true|false]
    If true is given, after hash check using --check-integrity option and file is complete, continue to seed file. If you want to check file and download it only when it is damaged or incomplete, set this option to false. This option has effect only on BitTorrent download. Default: true

--bt-lpd-interface=<INTERFACE>
    Use given interface for Local Peer Discovery. If this option is not specified, the default interface is chosen. You can specify interface name and IP address. Possible Values: interface, IP addres

--bt-max-open-files=<NUM>
    Specify maximum number of files to open in each BitTorrent download. Default: 100

--bt-max-peers=<NUM>
    Specify the maximum number of peers per torrent. 0 means unlimited. See also --bt-request-peer-speed-limit option. Default: 55

--bt-metadata-only[=true|false]
    Download metadata only. The file(s) described in metadata will not be downloaded. This option has effect only when BitTorrent Magnet URI is used. See also --bt-save-metadata option. Default: false

--bt-min-crypto-level=plain|arc4
    Set minimum level of encryption method. If several encryption methods are provided by a peer, aria2 chooses the lowest one which satisfies the given level. Default: plain

--bt-prioritize-piece=head[=<SIZE>],tail[=<SIZE>]
    Try to download first and last pieces of each file first. This is useful for previewing files. The argument can contain 2 keywords: head and tail. To include both keywords, they must be separated by comma. These keywords can take one parameter, SIZE. For example, if head=<SIZE> is specified, pieces in the range of first SIZE bytes of each file get higher priority. tail=<SIZE> means the range of last SIZE bytes of each file. SIZE can include K or M (1K = 1024, 1M = 1024K). If SIZE is omitted, SIZE=1M is used.

--bt-remove-unselected-file[=true|false]
    Removes the unselected files when download is completed in BitTorrent. To select files, use --select-file option. If it is not used, all files are assumed to be selected. Please use this option with care because it will actually remove files from your disk. Default: false

--bt-require-crypto[=true|false]
    If true is given, aria2 doesn't accept and establish connection with legacy BitTorrent handshake(19BitTorrent protocol). Thus aria2 always uses Obfuscation handshake. Default: false

--bt-request-peer-speed-limit=<SPEED>
    If the whole download speed of every torrent is lower than SPEED, aria2 temporarily increases the number of peers to try for more download speed. Configuring this option with your preferred download speed can increase your download speed in some cases. You can append K or M (1K = 1024, 1M = 1024K). Default: 50K

--bt-save-metadata[=true|false]
    Save metadata as ".torrent" file. This option has effect only when BitTorrent Magnet URI is used. The filename is hex encoded info hash with suffix ".torrent". The directory to be saved is the same directory where download file is saved. If the same file already exists, metadata is not saved. See also --bt-metadata-only option. Default: false

--bt-seed-unverified[=true|false]
    Seed previously downloaded files without verifying piece hashes. Default: false

--bt-stop-timeout=<SEC>
    Stop BitTorrent download if download speed is 0 in consecutive SEC seconds. If 0 is given, this feature is disabled. Default: 0

--bt-tracker=<URI>[,...]
    Comma separated list of additional BitTorrent tracker's announce URI. These URIs are not affected by --bt-exclude-tracker option because they are added after URIs in --bt-exclude-tracker option are removed.

--bt-tracker-connect-timeout=<SEC>
    Set the connect timeout in seconds to establish connection to tracker. After the connection is established, this option makes no effect and --bt-tracker-timeout option is used instead. Default: 60

--bt-tracker-interval=<SEC>
    Set the interval in seconds between tracker requests. This completely overrides interval value and aria2 just uses this value and ignores the min interval and interval value in the response of tracker. If 0 is set, aria2 determines interval based on the response of tracker and the download progress. Default: 0

--bt-tracker-timeout=<SEC>
    Set timeout in seconds. Default: 60

--dht-entry-point=<HOST>:<PORT>
    Set host and port as an entry point to IPv4 DHT network.

--dht-entry-point6=<HOST>:<PORT>
    Set host and port as an entry point to IPv6 DHT network.

--dht-file-path=<PATH>
    Change the IPv4 DHT routing table file to PATH. Default: $HOME/.aria2/dht.dat

--dht-file-path6=<PATH>
    Change the IPv6 DHT routing table file to PATH. Default: $HOME/.aria2/dht6.dat

--dht-listen-addr6=<ADDR>
    Specify address to bind socket for IPv6 DHT. It should be a global unicast IPv6 address of the host.

--dht-listen-port=<PORT>...
    Set UDP listening port for both IPv4 and IPv6 DHT. Multiple ports can be specified by using ,, for example: 6881,6885. You can also use - to specify a range: 6881-6999. , and - can be used together. Default: 6881-6999

Note
    Make sure that the specified ports are open for incoming UDP traffic.

--dht-message-timeout=<SEC>
    Set timeout in seconds. Default: 10

--enable-dht[=true|false]
    Enable IPv4 DHT functionality. If a private flag is set in a torrent, aria2 doesn't use DHT for that download even if true is given. Default: true

--enable-dht6[=true|false]
    Enable IPv6 DHT functionality. If a private flag is set in a torrent, aria2 doesn't use DHT for that download even if true is given. Use --dht-listen-port option to specify port number to listen on. See also --dht-listen-addr6 option.

--enable-peer-exchange[=true|false]
    Enable Peer Exchange extension. If a private flag is set in a torrent, this feature is disabled for that download even if true is given. Default: true

--follow-torrent=true|false|mem
    If true or mem is specified, when a file whose suffix is .torrent or content type is application/x-bittorrent is downloaded, aria2 parses it as a torrent file and downloads files mentioned in it. If mem is specified, a torrent file is not written to the disk, but is just kept in memory. If false is specified, the action mentioned above is not taken. Default: true

-O, --index-out=<INDEX>=<PATH>
    Set file path for file with index=INDEX. You can find the file index using the --show-files option. PATH is a relative path to the path specified in --dir option. You can use this option multiple times. Using this option, you can specify the output filenames of BitTorrent downloads.

--listen-port=<PORT>...
    Set TCP port number for BitTorrent downloads. Multiple ports can be specified by using ,, for example: 6881,6885. You can also use - to specify a range: 6881-6999. , and - can be used together: 6881-6889,6999. Default: 6881-6999

Note
    Make sure that the specified ports are open for incoming TCP traffic.

--max-overall-upload-limit=<SPEED>
    Set max overall upload speed in bytes/sec. 0 means unrestricted. You can append K or M (1K = 1024, 1M = 1024K). To limit the upload speed per torrent, use --max-upload-limit option. Default: 0

-u, --max-upload-limit=<SPEED>
    Set max upload speed per each torrent in bytes/sec. 0 means unrestricted. You can append K or M (1K = 1024, 1M = 1024K). To limit the overall upload speed, use --max-overall-upload-limit option. Default: 0

--peer-id-prefix=<PEER_ID_PREFIX>
    Specify the prefix of peer ID. The peer ID in BitTorrent is 20 byte length. If more than 20 bytes are specified, only first 20 bytes are used. If less than 20 bytes are specified, random byte data are added to make its length 20 bytes. Default: aria2/$VERSION-, $VERSION is replaced by package version.

--seed-ratio=<RATIO>
    Specify share ratio. Seed completed torrents until share ratio reaches RATIO. You are strongly encouraged to specify equals or more than 1.0 here. Specify 0.0 if you intend to do seeding regardless of share ratio. If --seed-time option is specified along with this option, seeding ends when at least one of the conditions is satisfied. Default: 1.0

--seed-time=<MINUTES>
    Specify seeding time in minutes. Also see the --seed-ratio option.

Note
    Specifying --seed-time=0 disables seeding after download completed.

-T, --torrent-file=<TORRENT_FILE>
    The path to the ".torrent" file. You are not required to use this option because you can specify ".torrent" files without --torrent-file.

  Metalink Specific Options

--follow-metalink=true|false|mem
    If true or mem is specified, when a file whose suffix is .meta4 or .metalink or content type of application/metalink4+xml or application/metalink+xml is downloaded, aria2 parses it as a metalink file and downloads files mentioned in it. If mem is specified, a metalink file is not written to the disk, but is just kept in memory. If false is specified, the action mentioned above is not taken. Default: true

--metalink-base-uri=<URI>
    Specify base URI to resolve relative URI in metalink:url and metalink:metaurl element in a metalink file stored in local disk. If URI points to a directory, URI must end with /.

-M, --metalink-file=<METALINK_FILE>
    The file path to ".meta4" and ".metalink" file. Reads input from stdin when - is specified. You are not required to use this option because you can specify ".metalink" files without --metalink-file.

--metalink-language=<LANGUAGE>
    The language of the file to download.

--metalink-location=<LOCATION>[,...]
    The location of the preferred server. A comma-delimited list of locations is acceptable, for example, jp,us.

--metalink-os=<OS>
    The operating system of the file to download.

--metalink-version=<VERSION>
    The version of the file to download.

--metalink-preferred-protocol=<PROTO>
    Specify preferred protocol. The possible values are http, https, ftp and none. Specify none to disable this feature. Default: none

--metalink-enable-unique-protocol[=true|false]
    If true is given and several protocols are available for a mirror in a metalink file, aria2 uses one of them. Use --metalink-preferred-protocol option to specify the preference of protocol. Default: true

  RPC Options

--enable-rpc[=true|false]
    Enable JSON-RPC/XML-RPC server. It is strongly recommended to set username and password using --rpc-user and --rpc-passwd option. See also --rpc-listen-port option. Default: false

--pause[=true|false]
    Pause download after added. This option is effective only when --enable-rpc=true is given. Default: false

--rpc-allow-origin-all[=true|false]
    Add Access-Control-Allow-Origin header field with value * to the RPC response. Default: false

--rpc-listen-all[=true|false]
    Listen incoming JSON-RPC/XML-RPC requests on all network interfaces. If false is given, listen only on local loopback interface. Default: false

--rpc-listen-port=<PORT>
    Specify a port number for JSON-RPC/XML-RPC server to listen to. Possible Values: 1024 -65535 Default: 6800

--rpc-max-request-size=<SIZE>
    Set max size of JSON-RPC/XML-RPC request. If aria2 detects the request is more than SIZE bytes, it drops connection. Default: 2M

--rpc-passwd=<PASSWD>
    Set JSON-RPC/XML-RPC password.

--rpc-user=<USER>
    Set JSON-RPC/XML-RPC user.

  Advanced Options

--allow-overwrite[=true|false]
    Restart download from scratch if the corresponding control file doesn't exist. See also --auto-file-renaming option. Default: false

--allow-piece-length-change[=true|false]
    If false is given, aria2 aborts download when a piece length is different from one in a control file. If true is given, you can proceed but some download progress will be lost. Default: false

--always-resume[=true|false]
    Always resume download. If true is given, aria2 always tries to resume download and if resume is not possible, aborts download. If false is given, when all given URIs do not support resume or aria2 encounters N URIs which does not support resume (N is the value specified using --max-resume-failure-tries option), aria2 downloads file from scratch. See --max-resume-failure-tries option. Default: true

--async-dns[=true|false]
    Enable asynchronous DNS. Default: true

--async-dns-server=<IPADDRESS>[,...]
    Comma separated list of DNS server address used in asynchronous DNS resolver. Usually asynchronous DNS resolver reads DNS server addresses from /etc/resolv.conf. When this option is used, it uses DNS servers specified in this option instead of ones in /etc/resolv.conf. You can specify both IPv4 and IPv6 address. This option is useful when the system does not have /etc/resolv.conf and user does not have the permission to create it.

--auto-file-renaming[=true|false]
    Rename file name if the same file already exists. This option works only in HTTP(S)/FTP download. The new file name has a dot and a number(1..9999) appended. Default: true

--auto-save-interval=<SEC>
    Save a control file(*.aria2) every SEC seconds. If 0 is given, a control file is not saved during download. aria2 saves a control file when it stops regardless of the value. The possible values are between 0 to 600. Default: 60

--conditional-get[=true|false]
    Download file only when the local file is older than remote file. This function only works with HTTP(S) downloads only. It does not work if file size is specified in Metalink. It also ignores Content-Disposition header. If a control file exists, this option will be ignored. This function uses If-Modified-Since header to get only newer file conditionally. When getting modification time of local file, it uses user supplied filename(see --out option) or filename part in URI if --out is not specified. To overwrite existing file, --allow-overwrite is required. Default: false

--conf-path=<PATH>
    Change the configuration file path to PATH. Default: $HOME/.aria2/aria2.conf

-D, --daemon[=true|false]
    Run as daemon. The current working directory will be changed to / and standard input, standard output and standard error will be redirected to /dev/null. Default: false

--deferred-input[=true|false]
    If true is given, aria2 does not read all URIs and options from file specified by --input-file option at startup, but it reads one by one when it needs later. This may reduce memory usage if input file contains a lot of URIs to download. If false is given, aria2 reads all URIs and options at startup. Default: false

--disable-ipv6[=true|false]
    Disable IPv6. This is useful if you have to use broken DNS and want to avoid terribly slow AAAA record lookup. Default: false

--download-result=<OPT>
    This option changes the way Download Results is formatted. If OPT is default, print GID, status, average download speed and path/URI. If multiple files are involved, path/URI of first requested file is printed and remaining ones are omitted. If OPT is full, print GID, status, average download speed, percentage of progress and path/URI. The percentage of progress and path/URI are printed for each requested file in each row. Default: default

--enable-async-dns6[=true|false]
    Enable IPv6 name resolution in asynchronous DNS resolver. This option will be ignored when --async-dns=false. Default: false

--enable-mmap[=true|false]
    Map files into memory. This option may not work if the file space is not pre-allocated. See --file-allocation.

    Default: false

--event-poll=<POLL>
    Specify the method for polling events. The possible values are epoll, kqueue, port, poll and select. For each epoll, kqueue, port and poll, it is available if system supports it. epoll is available on recent Linux. kqueue is available on various *BSD systems including Mac OS X. port is available on Open Solaris. The default value may vary depending on the system you use.

--file-allocation=<METHOD>
    Specify file allocation method. none doesn't pre-allocate file space. prealloc pre-allocates file space before download begins. This may take some time depending on the size of the file. If you are using newer file systems such as ext4 (with extents support), btrfs, xfs or NTFS(MinGW build only), falloc is your best choice. It allocates large(few GiB) files almost instantly. Don't use falloc with legacy file systems such as ext3 and FAT32 because it takes almost same time as prealloc and it blocks aria2 entirely until allocation finishes. falloc may not be available if your system doesn't have posix_fallocate(3) function. trunc uses ftruncate(2) system call or platform-specific counterpart to truncate a file to a specified length.

    Possible Values: none, prealloc, trunc, falloc Default: prealloc

--hash-check-only[=true|false]
    If true is given, after hash check using --check-integrity option, abort download whether or not download is complete. Default: false

--human-readable[=true|false]
    Print sizes and speed in human readable format (e.g., 1.2Ki, 3.4Mi) in the console readout. Default: true

--interface=<INTERFACE>
    Bind sockets to given interface. You can specify interface name, IP address and hostname. Possible Values: interface, IP address, hostname

Note
    If an interface has multiple addresses, it is highly recommended to specify IP address explicitly. See also --disable-ipv6. If your system doesn't have getifaddrs(3), this option doesn't accept interface name.

--max-download-result=<NUM>
    Set maximum number of download result kept in memory. The download results are completed/error/removed downloads. The download results are stored in FIFO queue and it can store at most NUM download results. When queue is full and new download result is created, oldest download result is removed from the front of the queue and new one is pushed to the back. Setting big number in this option may result high memory consumption after thousands of downloads. Specifying 0 means no download result is kept. Default: 1000

--max-resume-failure-tries=<N>
    When used with --always-resume=false, aria2 downloads file from scratch when aria2 detects N number of URIs that does not support resume. If N is 0, aria2 downloads file from scratch when all given URIs do not support resume. See --always-resume option. Default: 0

--log-level=<LEVEL>
    Set log level to output. LEVEL is either debug, info, notice, warn or error. Default: debug

--on-bt-download-complete=<COMMAND>
    For BitTorrent, a command specified in --on-download-complete is called after download completed and seeding is over. On the other hand, this option set the command to be executed after download completed but before seeding. See Event Hook for more details about COMMAND. Possible Values: /path/to/command

--on-download-complete=<COMMAND>
    Set the command to be executed after download completed. See See Event Hook for more details about COMMAND. See also --on-download-stop option. Possible Values: /path/to/command

--on-download-error=<COMMAND>
    Set the command to be executed after download aborted due to error. See Event Hook for more details about COMMAND. See also --on-download-stop option. Possible Values: /path/to/command

--on-download-pause=<COMMAND>
    Set the command to be executed after download was paused. See Event Hook for more details about COMMAND. Possible Values: /path/to/command

--on-download-start=<COMMAND>
    Set the command to be executed after download got started. See Event Hook for more details about COMMAND. Possible Values: /path/to/command

--on-download-stop=<COMMAND>
    Set the command to be executed after download stopped. You can override the command to be executed for particular download result using --on-download-complete and --on-download-error. If they are specified, command specified in this option is not executed. See Event Hook for more details about COMMAND. Possible Values: /path/to/command

--piece-length=<LENGTH>
    Set a piece length for HTTP/FTP downloads. This is the boundary when aria2 splits a file. All splits occur at multiple of this length. This option will be ignored in BitTorrent downloads. It will be also ignored if Metalink file contains piece hashes. Default: 1M

Note
    The possible usecase of --piece-length option is change the request range in one HTTP pipelined request. To enable HTTP pipelining use --enable-http-pipelining.

--show-console-readout[=true|false]
    Show console readout. Default: true

--summary-interval=<SEC>
    Set interval in seconds to output download progress summary. Setting 0 suppresses the output. Default: 60

Note
    In multi file torrent downloads, the files adjacent forward to the specified files are also allocated if they share the same piece.

-Z, --force-sequential[=true|false]
    Fetch URIs in the command-line sequentially and download each URI in a separate session, like the usual command-line download utilities. Default: false

--max-overall-download-limit=<SPEED>
    Set max overall download speed in bytes/sec. 0 means unrestricted. You can append K or M (1K = 1024, 1M = 1024K). To limit the download speed per download, use --max-download-limit option. Default: 0

--max-download-limit=<SPEED>
    Set max download speed per each download in bytes/sec. 0 means unrestricted. You can append K or M (1K = 1024, 1M = 1024K). To limit the overall download speed, use --max-overall-download-limit option. Default: 0

--no-conf[=true|false]
    Disable loading aria2.conf file.

--no-file-allocation-limit=<SIZE>
    No file allocation is made for files whose size is smaller than SIZE. You can append K or M (1K = 1024, 1M = 1024K). Default: 5M

-P, --parameterized-uri[=true|false]
    Enable parameterized URI support. You can specify set of parts: http://{sv1,sv2,sv3}/foo.iso. Also you can specify numeric sequences with step counter: http://host/image[000-100:2].img. A step counter can be omitted. If all URIs do not point to the same file, such as the second example above, -Z option is required. Default: false

-q, --quiet[=true|false]
    Make aria2 quiet (no console output). Default: false

--realtime-chunk-checksum[=true|false]
    Validate chunk of data by calculating checksum while downloading a file if chunk checksums are provided. Default: true

--remove-control-file[=true|false]
    Remove control file before download. Using with --allow-overwrite=true, download always starts from scratch. This will be useful for users behind proxy server which disables resume.

--save-session=<FILE>
    Save error/unfinished downloads to FILE on exit. You can pass this output file to aria2c with --input-file option on restart. Please note that downloads added by aria2.addTorrent() and aria2.addMetalink() RPC method and whose metadata could not be saved as a file are not saved. Downloads removed using aria2.remove() and aria2.forceRemove() will not be saved.

--stop=<SEC>
    Stop application after SEC seconds has passed. If 0 is given, this feature is disabled. Default: 0

--stop-with-process=<PID>
    Stop application when process PID is not running. This is useful if aria2 process is forked from a parent process. The parent process can fork aria2 with its own pid and when parent process exits for some reason, aria2 can detect it and shutdown itself.

--truncate-console-readout[=true|false]
    Truncate console readout to fit in a single line. Default: true

-v, --version
    Print the version number, copyright and the configuration information and exit.

  Options That Take An Optional Argument

The options that have its argument surrounded by square brackets([]) take an optional argument. Usually omiting the argument is evaluated to true. If you use short form of these options(such as -V) and give an argument, then the option name and its argument should be concatenated(e.g. -Vfalse). If any spaces are inserted between the option name and the argument, the argument will be treated as URI and usually this is not what you expect.

  URI, MAGNET, TORRENT_FILE, METALINK_FILE

You can specify multiple URIs in command-line. Unless you specify --force-sequential option, all URIs must point to the same file or downloading will fail.

You can specify arbitrary number of BitTorrent Magnet URI. Please note that they are always treated as a separate download. Both hex encoded 40 characters Info Hash and Base32 encoded 32 characters Info Hash are supported. The multiple tr parameters are supported. Because BitTorrent Magnet URI is likely to contain & character, it is highly recommended to always quote URI with single(') or double(") quotation. It is strongly recommended to enable DHT especially when tr parameter is missing. See http://www.bittorrent.org/beps/bep_0009.html for more details about BitTorrent Magnet URI.

You can also specify arbitrary number of torrent files and Metalink documents stored on a local drive. Please note that they are always treated as a separate download. Both Metalink4 and Metalink version 3.0 are supported.

You can specify both torrent file with -T option and URIs. By doing this, you can download a file from both torrent swarm and HTTP(S)/FTP server at the same time, while the data from HTTP(S)/FTP are uploaded to the torrent swarm. For single file torrents, URI can be a complete URI pointing to the resource or if URI ends with /, name in torrent file in torrent is added. For multi-file torrents, name and path are added to form a URI for each file.

Note
    Make sure that URI is quoted with single(') or double(") quotation if it contains & or any characters that have special meaning in shell.

  Resuming Download

Usually, you can resume transfer by just issuing same command(aria2c URI) if the previous transfer is made by aria2.

If the previous transfer is made by a browser or wget like sequential download manager, then use --continue option to continue the transfer.

  Event Hook

aria2 provides options to specify arbitrary command after specific event occurred. Currently following options are available: --on-bt-download-complete, --on-download-pause, --on-download-complete. --on-download-start, --on-download-error, --on-download-stop.

aria2 passes 3 arguments to specified command when it is executed. These arguments are: GID, the number of files and file path. For HTTP, FTP downloads, usually the number of files is 1. BitTorrent download can contain multiple files. If number of files is more than one, file path is first one. In other words, this is the value of path key of first struct whose selected key is true in the response of aria2.getFiles() RPC method. If you want to get all file paths, consider to use JSON-RPC/XML-RPC. Please note that file path may change during download in HTTP because of redirection or Content-Disposition header.

Let's see an example of how arguments are passed to command:

$ cat hook.sh
#!/bin/sh
echo "Called with [$1] [$2] [$3]"
$ aria2c --on-download-complete hook.sh http://example.org/file.iso
Called with [1] [1] [/path/to/file.iso]

EXIT STATUS

Because aria2 can handle multiple downloads at once, it encounters lots of errors in a session. aria2 returns the following exit status based on the last error encountered.

0   If all downloads were successful.

1   If an unknown error occurred.

2   If time out occurred.

3   If a resource was not found.

4   If aria2 saw the specfied number of "resource not found" error. See --max-file-not-found option).

5   If a download aborted because download speed was too slow. See --lowest-speed-limit option)

6   If network problem occurred.

7   If there were unfinished downloads. This error is only reported if all finished downloads were successful and there were unfinished downloads in a queue when aria2 exited by pressing Ctrl-C by an user or sending TERM or INT signal.

8   If remote server did not support resume when resume was required to complete download.

9   If there was not enough disk space available.

10  If piece length was different from one in .aria2 control file. See --allow-piece-length-change option.

11  If aria2 was downloading same file at that moment.

12  If aria2 was downloading same info hash torrent at that moment.

13  If file already existed. See --allow-overwrite option.

14  If renaming file failed. See --auto-file-renaming option.

15  If aria2 could not open existing file.

16  If aria2 could not create new file or truncate existing file.

17  If file I/O error occurred.

18  If aria2 could not create directory.

19  If name resolution failed.

20  If aria2 could not parse Metalink document.

21  If FTP command failed.

22  If HTTP response header was bad or unexpected.

23  If too many redirections occurred.

24  If HTTP authorization failed.

25  If aria2 could not parse bencoded file(usually ".torrent" file).

26  If ".torrent" file was corrupted or missing information that aria2 needed.

27  If Magnet URI was bad.

28  If bad/unrecognized option was given or unexpected option argument was given.

29  If the remote server was unable to handle the request due to a temporary overloading or maintenance.

30  If aria2 could not parse JSON-RPC request.

Note
    An error occurred in a finished download will not be reported as exit status.

ENVIRONMENT

aria2 recognizes the following environment variables.

http_proxy [http://][USER:PASSWORD@]HOST[:PORT]
    Specify proxy server for use in HTTP. Overrides http-proxy value in configuration file. The command-line option --http-proxy overrides this value.

https_proxy [http://][USER:PASSWORD@]HOST[:PORT]
    Specify proxy server for use in HTTPS. Overrides https-proxy value in configuration file. The command-line option --https-proxy overrides this value.

ftp_proxy [http://][USER:PASSWORD@]HOST[:PORT]
    Specify proxy server for use in FTP. Overrides ftp-proxy value in configuration file. The command-line option --ftp-proxy overrides this value.

all_proxy [http://][USER:PASSWORD@]HOST[:PORT]
    Specify proxy server for use if no protocol-specific proxy is specified. Overrides all-proxy value in configuration file. The command-line option --all-proxy overrides this value.

Note
    Although aria2 accepts ftp:// and https:// scheme in proxy URI, it simply assumes that http:// is specified and does not change its behavior based on the specified scheme.

no_proxy [DOMAIN,...]
    Specify comma-separated hostname, domains and network address with or without CIDR block to which proxy should not be used. Overrides no-proxy value in configuration file. The command-line option --no-proxy overrides this value.

FILES

  aria2.conf

By default, aria2 parses $HOME/.aria2/aria2.conf as a configuraiton file. You can specify the path to configuration file using --conf-path option. If you don't want to use the configuraiton file, use --no-conf option.

The configuration file is a text file and has 1 option per each line. In each line, you can specify name-value pair in the format: NAME=VALUE, where name is the long command-line option name without -- prefix. You can use same syntax for the command-line option. The lines beginning # are treated as comments:

# sample configuration file for aria2c
listen-port=60000
dht-listen-port=60000
seed-ratio=1.0
max-upload-limit=50K
ftp-pasv=true

Note
    The confidential information such as user/password might be included in the configuration file. It is recommended to change file mode bits of the configuration file (e.g., chmod 600 aria2.conf), so that other user cannot see the contents of the file.

  dht.dat

By default, the routing table of IPv4 DHT is saved to the path $HOME/.aria2/dht.dat and the routing table of IPv6 DHT is saved to the path $HOME/.aria2/dht6.dat.

  Netrc

Netrc support is enabled by default for HTTP(S)/FTP. To disable netrc support, specify --no-netrc option. Your .netrc file should have correct permissions(600).

If machine name starts ., aria2 performs domain-match instead of exact match. This is an extension of aria2. For example of domain match, imagine the following .netrc entry:

machine .example.org login myid password mypasswd

aria2.example.org domain-matches .example.org and uses myid and mypasswd.

Some domain-match example follow: example.net does not domain-match .example.org. example.org does not domain-match .example.org because of preceding .. If you want to match example.org, specify example.org.

  Control File

aria2 uses a control file to track the progress of a download. A control file is placed in the same directory as the downloading file and its filename is the filename of downloading file with .aria2 appended. For example, if you are downloading file.zip, then the control file should be file.zip.aria2. (There is a exception for this naming convention. If you are downloading a multi torrent, its control file is the "top directory" name of the torrent with .aria2 appended. The "top directory" name is a value of "name" key in "info" directory in a torrent file.)

Usually a control file is deleted once download completed. If aria2 decides that download cannot be resumed(for example, when downloading a file from a HTTP server which doesn't support resume), a control file is not created.

Normally if you lose a control file, you cannot resume download. But if you have a torrent or metalink with chunk checksums for the file, you can resume the download without a control file by giving -V option to aria2c in command-line.

  Input File

The input file can contain a list of URIs for aria2 to download. You can specify multiple URIs for a single entity: separate URIs on a single line using the TAB character.

Each line is treated as if it is provided in command-line argument. Therefore they are affected by --force-sequential and --parameterized-uri options.

Since URIs in the input file are directly read by aria2, they must not be quoted with single(') or double(") quotation.

Lines starting with # are treated as comments and skipped.

Additionally, the following options can be specified after each line of URIs. These optional lines must start with white space(s).

•   all-proxy

•   all-proxy-passwd

•   all-proxy-user

•   allow-overwrite

•   allow-piece-length-change

•   always-resume

•   async-dns

•   auto-file-renaming

•   bt-enable-lpd

•   bt-exclude-tracker

•   bt-external-ip

•   bt-hash-check-seed

•   bt-max-open-files

•   bt-max-peers

•   bt-metadata-only

•   bt-min-crypto-level

•   bt-prioritize-piece

•   bt-remove-unselected-file

•   bt-request-peer-speed-limit

•   bt-require-crypto

•   bt-save-metadata

•   bt-seed-unverified

•   bt-stop-timeout

•   bt-tracker

•   bt-tracker-connect-timeout

•   bt-tracker-interval

•   bt-tracker-timeout

•   check-integrity

•   checksum

•   conditional-get

•   connect-timeout

•   continue

•   dir

•   dry-run

•   enable-async-dns6

•   enable-http-keep-alive

•   enable-http-pipelining

•   enable-mmap

•   enable-peer-exchange

•   file-allocation

•   follow-metalink

•   follow-torrent

•   ftp-passwd

•   ftp-pasv

•   ftp-proxy

•   ftp-proxy-passwd

•   ftp-proxy-user

•   ftp-reuse-connection

•   ftp-type

•   ftp-user

•   hash-check-only

•   header

•   http-accept-gzip

•   http-auth-challenge

•   http-no-cache

•   http-passwd

•   http-proxy

•   http-proxy-passwd

•   http-proxy-user

•   http-user

•   https-proxy

•   https-proxy-passwd

•   https-proxy-user

•   index-out

•   lowest-speed-limit

•   max-connection-per-server

•   max-download-limit

•   max-file-not-found

•   max-resume-failure-tries

•   max-tries

•   max-upload-limit

•   metalink-base-uri

•   metalink-enable-unique-protocol

•   metalink-language

•   metalink-location

•   metalink-os

•   metalink-preferred-protocol

•   metalink-version

•   min-split-size

•   no-file-allocation-limit

•   no-netrc

•   no-proxy

•   out

•   parameterized-uri

•   pause

•   piece-length

•   proxy-method

•   realtime-chunk-checksum

•   referer

•   remote-time

•   remove-control-file

•   retry-wait

•   reuse-uri

•   seed-ratio

•   seed-time

•   select-file

•   split

•   stream-piece-selector

•   timeout

•   uri-selector

•   use-head

•   user-agent

    These options have exactly same meaning of the ones in the command-line options, but it just applies to the URIs it belongs to. Please note that for options in input file -- prefix must be stripped.

    For example, the content of uri.txt is:

    http://server/file.iso http://mirror/file.iso
      dir=/iso_images
      out=file.img
    http://foo/bar

    If aria2 is executed with -i uri.txt -d /tmp options, then file.iso is saved as /iso_images/file.img and it is downloaded from http://server/file.iso and http://mirror/file.iso. The file bar is downloaded from http://foo/bar and saved as /tmp/bar.

    In some cases, out parameter has no effect. See note of --out option for the restrictions.

  Server Performance Profile

This section describes the format of server performance profile. The file is plain text and each line has several NAME=VALUE pair, delimited by comma. Currently following NAMEs are recognized:

host
    Hostname of the server. Required.

protocol
    Protocol for this profile, such as ftp, http. Required.

dl_speed
    The average download speed observed in the previous download in bytes per sec. Required.

sc_avg_speed
    The average download speed observed in the previous download in bytes per sec. This value is only updated if the download is done in single connection environment and only used by AdaptiveURISelector. Optional.

mc_avg_speed
    The average download speed observed in the previous download in bytes per sec. This value is only updated if the download is done in multi connection environment and only used by AdaptiveURISelector. Optional.

counter
    How many times the server is used. Currently this value is only used by AdaptiveURISelector. Optional.

last_updated
    Last contact time in GMT with this server, specified in the seconds since the Epoch(00:00:00 on January 1, 1970, UTC). Required.

status
    ERROR is set when server cannot be reached or out-of-service or timeout occurred. Otherwise, OK is set.

    Those fields must exist in one line. The order of the fields is not significant. You can put pairs other than the above; they are simply ignored.

    An example follows:

    host=localhost, protocol=http, dl_speed=32000, last_updated=1222491640, status=OK
    host=localhost, protocol=ftp, dl_speed=0, last_updated=1222491632, status=ERROR

RPC INTERFACE

aria2 provides JSON-RPC over HTTP and XML-RPC over HTTP and they basically have the same functionality. aria2 also provides JSON-RPC over WebSocket. JSON-RPC over WebSocket uses same method signatures and response format with JSON-RPC over HTTP, but it additionally has server-initiated notifications. See JSON-RPC over WebSocket section for details.

The request path of JSON-RPC interface (for both over HTTP and over WebSocket) is /jsonrpc. The request path of XML-RPC interface is /rpc.

The WebSocket URI for JSON-RPC over WebSocket is ws://HOST:PORT/jsonrpc.

The implemented JSON-RPC is based on JSON-RPC 2.0 <http://jsonrpc.org/specification>, and supports HTTP POST and GET (JSONP). Using WebSocket as a transport is the original extension of aria2.

The JSON-RPC interface does not support notification in HTTP, but the RPC server will send the notification in WebSocket. It also does not support floating point number. The character encoding must be UTF-8.

When reading following document for JSON-RPC, interpret struct as JSON object.

  Terminology

GID GID(or gid) is the key to manage each download. Each download has an unique GID. Currently GID looks like an integer, but don't treat it as integer because it may be changed to another type in the future release. Please note that GID is session local and not persisted when aria2 exits.

  Methods

All code examples come from Python2.7 interpreter.

aria2.addUri(uris[, options[, position]])
    This method adds new HTTP(S)/FTP/BitTorrent Magnet URI. uris is of type array and its element is URI which is of type string. For BitTorrent Magnet URI, uris must have only one element and it should be BitTorrent Magnet URI. URIs in uris must point to the same file. If you mix other URIs which point to another file, aria2 does not complain but download may fail. options is of type struct and its members are a pair of option name and value. See Options below for more details. If position is given as an integer starting from 0, the new download is inserted at position in the waiting queue. If position is not given or position is larger than the size of the queue, it is appended at the end of the queue. This method returns GID of registered download.

    JSON-RPC Example

    The following example adds http://example.org/file to aria2:

    >>> import urllib2, json
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.addUri',
    ...                       'params':[['http://example.org/file']]})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> c.read()
    '{"id":"qwer","jsonrpc":"2.0","result":"1"}'

    XML-RPC Example

    The following example adds http://example.org/file to aria2:

    >>> import xmlrpclib
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> s.aria2.addUri(['http://example.org/file'])
    '1'

    The following example adds 2 sources and some options:

    >>> s.aria2.addUri(['http://example.org/file', 'http://mirror/file'],
                        dict(dir="/tmp"))
    '2'

    The following example adds a download and insert it to the front of waiting downloads:

    >>> s.aria2.addUri(['http://example.org/file'], {}, 0)
    '3'

aria2.addTorrent(torrent[, uris[, options[, position]]])
    This method adds BitTorrent download by uploading ".torrent" file. If you want to add BitTorrent Magnet URI, use aria2.addUri() method instead. torrent is of type base64 which contains Base64-encoded ".torrent" file. uris is of type array and its element is URI which is of type string. uris is used for Web-seeding. For single file torrents, URI can be a complete URI pointing to the resource or if URI ends with /, name in torrent file is added. For multi-file torrents, name and path in torrent are added to form a URI for each file. options is of type struct and its members are a pair of option name and value. See Options below for more details. If position is given as an integer starting from 0, the new download is inserted at position in the waiting queue. If position is not given or position is larger than the size of the queue, it is appended at the end of the queue. This method returns GID of registered download. The uploaded data is saved as a file named hex string of SHA-1 hash of data plus ".torrent" in the directory specified by --dir option. The example of filename is 0a3893293e27ac0490424c06de4d09242215f0a6.torrent. If same file already exists, it is overwritten. If the file cannot be saved successfully, the downloads added by this method are not saved by --save-session.

    JSON-RPC Example

    The following example adds local file file.torrent to aria2:

    >>> import urllib2, json, base64
    >>> torrent = base64.b64encode(open('file.torrent').read())
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'asdf',
    ...                       'method':'aria2.addTorrent', 'params':[torrent]})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> c.read()
    '{"id":"asdf","jsonrpc":"2.0","result":"6"}'

    XML-RPC Example

    The following example adds local file file.torrent to aria2:

    >>> import xmlrpclib
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> s.aria2.addTorrent(xmlrpclib.Binary(open('file.torrent').read()))
    '6'

aria2.addMetalink(metalink[, options[, position]])
    This method adds Metalink download by uploading ".metalink" file. metalink is of type base64 which contains Base64-encoded ".metalink" file. options is of type struct and its members are a pair of option name and value. See Options below for more details. If position is given as an integer starting from 0, the new download is inserted at position in the waiting queue. If position is not given or position is larger than the size of the queue, it is appended at the end of the queue. This method returns array of GID of registered download. The uploaded data is saved as a file named hex string of SHA-1 hash of data plus ".metalink" in the directory specified by --dir option. The example of filename is 0a3893293e27ac0490424c06de4d09242215f0a6.metalink. If same file already exists, it is overwritten. If the file cannot be saved successfully, the downloads added by this method are not saved by --save-session.

    JSON-RPC Example

    The following example adds local file file.meta4 to aria2:

    >>> import urllib2, json, base64
    >>> metalink = base64.b64encode(open('file.meta4').read())
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.addMetalink', 'params':[metalink]})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> c.read()
    '{"id":"qwer","jsonrpc":"2.0","result":["8"]}'

    XML-RPC Example

    The following example adds local file file.meta4 to aria2:

    >>> import xmlrpclib
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> s.aria2.addMetalink(xmlrpclib.Binary(open('file.meta4').read()))
    ['8']

aria2.remove(gid)
    This method removes the download denoted by gid. gid is of type string. If specified download is in progress, it is stopped at first. The status of removed download becomes "removed". This method returns GID of removed download.

    JSON-RPC Example

    The following example removes download whose GID is "3":

    >>> import urllib2, json
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.remove', 'params':['3']})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> c.read()
    '{"id":"qwer","jsonrpc":"2.0","result":"3"}'

    XML-RPC Example

    The following example removes download whose GID is "3":

    >>> import xmlrpclib
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> s.aria2.remove('3')
    '3'

aria2.forceRemove(gid)
    This method removes the download denoted by gid. This method behaves just like aria2.remove() except that this method removes download without any action which takes time such as contacting BitTorrent tracker.

aria2.pause(gid)
    This method pauses the download denoted by gid. gid is of type string. The status of paused download becomes "paused". If the download is active, the download is placed on the first position of waiting queue. As long as the status is "paused", the download is not started. To change status to "waiting", use aria2.unpause() method. This method returns GID of paused download.

aria2.pauseAll()
    This method is equal to calling aria2.pause() for every active/waiting download. This methods returns "OK" for success.

aria2.forcePause(pid)
    This method pauses the download denoted by gid. This method behaves just like aria2.pause() except that this method pauses download without any action which takes time such as contacting BitTorrent tracker.

aria2.forcePauseAll()
    This method is equal to calling aria2.forcePause() for every active/waiting download. This methods returns "OK" for success.

aria2.unpause(gid)
    This method changes the status of the download denoted by gid from "paused" to "waiting". This makes the download eligible to restart. gid is of type string. This method returns GID of unpaused download.

aria2.unpauseAll()
    This method is equal to calling aria2.unpause() for every active/waiting download. This methods returns "OK" for success.

aria2.tellStatus(gid[, keys])
    This method returns download progress of the download denoted by gid. gid is of type string. keys is array of string. If it is specified, the response contains only keys in keys array. If keys is empty or not specified, the response contains all keys. This is useful when you just want specific keys and avoid unnecessary transfers. For example, aria2.tellStatus("1", ["gid", "status"]) returns gid and 'status' key. The response is of type struct and it contains following keys. The value type is string.

gid GID of this download.

status
    "active" for currently downloading/seeding entry. "waiting" for the entry in the queue; download is not started. "paused" for the paused entry. "error" for the stopped download because of error. "complete" for the stopped and completed download. "removed" for the download removed by user.

totalLength
    Total length of this download in bytes.

completedLength
    Completed length of this download in bytes.

uploadLength
    Uploaded length of this download in bytes.

bitfield
    Hexadecimal representation of the download progress. The highest bit corresponds to piece index 0. The set bits indicate the piece is available and unset bits indicate the piece is missing. The spare bits at the end are set to zero. When download has not started yet, this key will not be included in the response.

downloadSpeed
    Download speed of this download measured in bytes/sec.

uploadSpeed
    Upload speed of this download measured in bytes/sec.

infoHash
    InfoHash. BitTorrent only.

numSeeders
    The number of seeders the client has connected to. BitTorrent only.

pieceLength
    Piece length in bytes.

numPieces
    The number of pieces.

connections
    The number of peers/servers the client has connected to.

errorCode
    The last error code occurred in this download. The value is of type string. The error codes are defined in EXIT STATUS section. This value is only available for stopped/completed downloads.

followedBy
    List of GIDs which are generated by the consequence of this download. For example, when aria2 downloaded Metalink file, it generates downloads described in it(see --follow-metalink option). This value is useful to track these auto generated downloads. If there is no such downloads, this key will not be included in the response.

belongsTo
    GID of a parent download. Some downloads are a part of another download. For example, if a file in Metalink has BitTorrent resource, the download of ".torrent" is a part of that file. If this download has no parent, this key will not be included in the response.

dir Directory to save files. This key is not available for stopped downloads.

files
    Returns the list of files. The element of list is the same struct used in aria2.getFiles() method.

bittorrent
    Struct which contains information retrieved from .torrent file. BitTorrent only. It contains following keys.

announceList
    List of lists of announce URI. If ".torrent" file contains announce and no announce-list, announce is converted to announce-list format.

comment
    The comment for the torrent. comment.utf-8 is used if available.

creationDate
    The creation time of the torrent. The value is an integer since the Epoch, measured in seconds.

mode
    File mode of the torrent. The value is either 'single' or 'multi'.

info
    Struct which contains data from Info dictionary. It contains following keys.

name
    name in info dictionary. name.utf-8 is used if available.

    JSON-RPC Example

    The following example gets information about download whose GID is "1":

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.tellStatus', 'params':['1']})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer',
     u'jsonrpc': u'2.0',
     u'result': {u'bitfield': u'0000000000',
                 u'completedLength': u'901120',
                 u'connections': u'1',
                 u'dir': u'/downloads',
                 u'downloadSpeed': u'15158',
                 u'files': [{u'index': u'1',
                             u'length': u'34896138',
                             u'completedLength': u'34896138',
                             u'path': u'/downloads/file',
                             u'selected': u'true',
                             u'uris': [{u'status': u'used',
                                        u'uri': u'http://example.org/file'}]}],
                 u'gid': u'1',
                 u'numPieces': u'34',
                 u'pieceLength': u'1048576',
                 u'status': u'active',
                 u'totalLength': u'34896138',
                 u'uploadLength': u'0',
                 u'uploadSpeed': u'0'}}

    The following example gets information specifying keys you are interested in:

    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.tellStatus',
    ...                       'params':['1', ['gid',
    ...                                       'totalLength',
    ...                                       'completedLength']]})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer',
     u'jsonrpc': u'2.0',
     u'result': {u'completedLength': u'5701632',
                 u'gid': u'1',
                 u'totalLength': u'34896138'}}

    XML-RPC Example

    The following example gets information about download whose GID is "1":

    >>> import xmlrpclib
    >>> from pprint import pprint
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> r = s.aria2.tellStatus('1')
    >>> pprint(r)
    {'bitfield': 'ffff80',
     'completedLength': '34896138',
     'connections': '0',
     'dir': '/downloads',
     'downloadSpeed': '0',
     'errorCode': '0',
     'files': [{'index': '1',
                'length': '34896138',
                'completedLength': '34896138',
                'path': '/downloads/file',
                'selected': 'true',
                'uris': [{'status': 'used',
                          'uri': 'http://example.org/file'}]}],
     'gid': '1',
     'numPieces': '17',
     'pieceLength': '2097152',
     'status': 'complete',
     'totalLength': '34896138',
     'uploadLength': '0',
     'uploadSpeed': '0'}

    The following example gets information specifying keys you are interested in:

    >>> r = s.aria2.tellStatus('1', ['gid', 'totalLength', 'completedLength'])
    >>> pprint(r)
    {'completedLength': '34896138', 'gid': '1', 'totalLength': '34896138'}

aria2.getUris(gid)
    This method returns URIs used in the download denoted by gid. gid is of type string. The response is of type array and its element is of type struct and it contains following keys. The value type is string.

uri URI

status
    'used' if the URI is already used. 'waiting' if the URI is waiting in the queue.

    JSON-RPC Example

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.getUris', 'params':['1']})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer',
     u'jsonrpc': u'2.0',
     u'result': [{u'status': u'used',
                  u'uri': u'http://example.org/file'}]}

    XML-RPC Example

    >>> import xmlrpclib
    >>> from pprint import pprint
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> r = s.aria2.getUris('1')
    >>> pprint(r)
    [{'status': 'used', 'uri': 'http://example.org/file'}]

aria2.getFiles(gid)
    This method returns file list of the download denoted by gid. gid is of type string. The response is of type array and its element is of type struct and it contains following keys. The value type is string.

index
    Index of file. Starting with 1. This is the same order with the files in multi-file torrent.

path
    File path.

length
    File size in bytes.

completedLength
    Completed length of this file in bytes. Please note that it is possible that sum of completedLength is less than completedLength in aria2.tellStatus() method. This is because completedLength in aria2.getFiles() only calculates completed pieces. On the other hand, completedLength in aria2.tellStatus() takes into account of partially completed piece.

selected
    "true" if this file is selected by --select-file option. If --select-file is not specified or this is single torrent or no torrent download, this value is always "true". Otherwise "false".

uris
    Returns the list of URI for this file. The element of list is the same struct used in aria2.getUris() method.

    JSON-RPC Example

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.getFiles', 'params':['1']})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer',
     u'jsonrpc': u'2.0',
     u'result': [{u'index': u'1',
                  u'length': u'34896138',
                  u'completedLength': u'34896138',
                  u'path': u'/downloads/file',
                  u'selected': u'true',
                  u'uris': [{u'status': u'used',
                             u'uri': u'http://example.org/file'}]}]}

    XML-RPC Example

    >>> import xmlrpclib
    >>> from pprint import pprint
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> r = s.aria2.getFiles('1')
    >>> pprint(r)
    [{'index': '1',
      'length': '34896138',
      'completedLength': '34896138',
      'path': '/downloads/file',
      'selected': 'true',
      'uris': [{'status': 'used',
                'uri': 'http://example.org/file'}]}]

aria2.getPeers(gid)
    This method returns peer list of the download denoted by gid. gid is of type string. This method is for BitTorrent only. The response is of type array and its element is of type struct and it contains following keys. The value type is string.

peerId
    Percent-encoded peer ID.

ip  IP address of the peer.

port
    Port number of the peer.

bitfield
    Hexadecimal representation of the download progress of the peer. The highest bit corresponds to piece index 0. The set bits indicate the piece is available and unset bits indicate the piece is missing. The spare bits at the end are set to zero.

amChoking
    "true" if this client is choking the peer. Otherwise "false".

peerChoking
    "true" if the peer is choking this client. Otherwise "false".

downloadSpeed
    Download speed (byte/sec) that this client obtains from the peer.

uploadSpeed
    Upload speed(byte/sec) that this client uploads to the peer.

seeder
    "true" is this client is a seeder. Otherwise "false".

    JSON-RPC Example

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.getPeers', 'params':['1']})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer',
     u'jsonrpc': u'2.0',
     u'result': [{u'amChoking': u'true',
                  u'bitfield': u'ffffffffffffffffffffffffffffffffffffffff',
                  u'downloadSpeed': u'10602',
                  u'ip': u'10.0.0.9',
                  u'peerChoking': u'false',
                  u'peerId': u'aria2%2F1%2E10%2E5%2D%87%2A%EDz%2F%F7%E6',
                  u'port': u'6881',
                  u'seeder': u'true',
                  u'uploadSpeed': u'0'},
                 {u'amChoking': u'false',
                  u'bitfield': u'ffffeff0fffffffbfffffff9fffffcfff7f4ffff',
                  u'downloadSpeed': u'8654',
                  u'ip': u'10.0.0.30',
                  u'peerChoking': u'false',
                  u'peerId': u'bittorrent client758',
                  u'port': u'37842',
                  u'seeder': u'false',
                  u'uploadSpeed': u'6890'}]}

    XML-RPC Example

    >>> import xmlrpclib
    >>> from pprint import pprint
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> r = s.aria2.getPeers('1')
    >>> pprint(r)
    [{'amChoking': 'true',
      'bitfield': 'ffffffffffffffffffffffffffffffffffffffff',
      'downloadSpeed': '10602',
      'ip': '10.0.0.9',
      'peerChoking': 'false',
      'peerId': 'aria2%2F1%2E10%2E5%2D%87%2A%EDz%2F%F7%E6',
      'port': '6881',
      'seeder': 'true',
      'uploadSpeed': '0'},
     {'amChoking': 'false',
      'bitfield': 'ffffeff0fffffffbfffffff9fffffcfff7f4ffff',
      'downloadSpeed': '8654',
      'ip': '10.0.0.30',
      'peerChoking': 'false',
      'peerId': 'bittorrent client758',
      'port': '37842',
      'seeder': 'false,
      'uploadSpeed': '6890'}]

aria2.getServers(gid)
    This method returns currently connected HTTP(S)/FTP servers of the download denoted by gid. gid is of type string. The response is of type array and its element is of type struct and it contains following keys. The value type is string.

index
    Index of file. Starting with 1. This is the same order with the files in multi-file torrent.

servers
    The list of struct which contains following keys.

uri URI originally added.

currentUri
    This is the URI currently used for downloading. If redirection is involved, currentUri and uri may differ.

downloadSpeed
    Download speed (byte/sec)

    JSON-RPC Example

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.getServers', 'params':['1']})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer',
     u'jsonrpc': u'2.0',
     u'result': [{u'index': u'1',
                  u'servers': [{u'currentUri': u'http://example.org/file',
                                u'downloadSpeed': u'10467',
                                u'uri': u'http://example.org/file'}]}]}

    XML-RPC Example

    >>> import xmlrpclib
    >>> from pprint import pprint
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> r = s.aria2.getServers('1')
    >>> pprint(r)
    [{'index': '1',
      'servers': [{'currentUri': 'http://example.org/dl/file',
                   'downloadSpeed': '20285',
                   'uri': 'http://example.org/file'}]}]

aria2.tellActive([keys])
    This method returns the list of active downloads. The response is of type array and its element is the same struct returned by aria2.tellStatus() method. For keys parameter, please refer to aria2.tellStatus() method.

aria2.tellWaiting(offset, num[, keys])
    This method returns the list of waiting download, including paused downloads. offset is of type integer and specifies the offset from the download waiting at the front. num is of type integer and specifies the number of downloads to be returned. For keys parameter, please refer to aria2.tellStatus() method.

    If offset is a positive integer, this method returns downloads in the range of [offset, offset + num).

    offset can be a negative integer. offset == -1 points last download in the waiting queue and offset == -2 points the download before the last download, and so on. The downloads in the response are in reversed order.

    For example, imagine that three downloads "A","B" and "C" are waiting in this order. aria2.tellWaiting(0, 1) returns ["A"]. aria2.tellWaiting(1, 2) returns ["B", "C"]. aria2.tellWaiting(-1, 2) returns ["C", "B"].

    The response is of type array and its element is the same struct returned by aria2.tellStatus() method.

aria2.tellStopped(offset, num[, keys])
    This method returns the list of stopped download. offset is of type integer and specifies the offset from the oldest download. num is of type integer and specifies the number of downloads to be returned. For keys parameter, please refer to aria2.tellStatus() method.

    offset and num have the same semantics as aria2.tellWaiting() method.

    The response is of type array and its element is the same struct returned by aria2.tellStatus() method.

aria2.changePosition(gid, pos, how)
    This method changes the position of the download denoted by gid. pos is of type integer. how is of type string. If how is "POS_SET", it moves the download to a position relative to the beginning of the queue. If how is "POS_CUR", it moves the download to a position relative to the current position. If how is "POS_END", it moves the download to a position relative to the end of the queue. If the destination position is less than 0 or beyond the end of the queue, it moves the download to the beginning or the end of the queue respectively. The response is of type integer and it is the destination position.

    For example, if GID#1 is placed in position 3, aria2.changePosition('1', -1, 'POS_CUR') will change its position to 2. Additional aria2.changePosition('1', 0, 'POS_SET') will change its position to 0(the beginning of the queue).

    JSON-RPC Example

    The following example moves the download whose GID is "3" to the front of the waiting queue:

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.changePosition',
    ...                       'params':['3', 0, 'POS_SET']})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer', u'jsonrpc': u'2.0', u'result': 0}

    XML-RPC Example

    The following example moves the download whose GID is "3" to the front of the waiting queue:

    >>> import xmlrpclib
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> s.aria2.changePosition('3', 0, 'POS_SET')
    0

aria2.changeUri(gid, fileIndex, delUris, addUris[, position])
    This method removes URIs in delUris from and appends URIs in addUris to download denoted by gid. delUris and addUris are list of string. A download can contain multiple files and URIs are attached to each file. fileIndex is used to select which file to remove/attach given URIs. fileIndex is 1-based. position is used to specify where URIs are inserted in the existing waiting URI list. position is 0-based. When position is omitted, URIs are appended to the back of the list. This method first execute removal and then addition. position is the position after URIs are removed, not the position when this method is called. When removing URI, if same URIs exist in download, only one of them is removed for each URI in delUris. In other words, there are three URIs http://example.org/aria2 and you want remove them all, you have to specify (at least) 3 http://example.org/aria2 in delUris. This method returns a list which contains 2 integers. The first integer is the number of URIs deleted. The second integer is the number of URIs added.

    JSON-RPC Example

    The following example adds 1 URI http://example.org/file to the file whose index is "1" and belongs to the download whose GID is "2":

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.changeUri',
    ...                       'params':['2', 1, [], ['http://example.org/file']]})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer', u'jsonrpc': u'2.0', u'result': [0, 1]}

    XML-RPC Example

    The following example adds 1 URI http://example.org/file to the file whose index is "1" and belongs to the download whose GID is "2":

    >>> import xmlrpclib
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> s.aria2.changeUri('2', 1, [], ['http://example.org/file'])
    [0, 1]

aria2.getOption(gid)
    This method returns options of the download denoted by gid. The response is of type struct. Its key is the name of option. The value type is string. Note that this method does not return options which have no default value and have not been set by the command-line options, configuration files or RPC methods.

    JSON-RPC Example

    The following example gets options of the download whose GID is "1":

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.getOption', 'params':['1']})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer',
     u'jsonrpc': u'2.0',
     u'result': {u'allow-overwrite': u'false',
                 u'allow-piece-length-change': u'false',
                 u'always-resume': u'true',
                 u'async-dns': u'true',
     ...

    XML-RPC Example

    The following example gets options of the download whose GID is "1":

    >>> import xmlrpclib
    >>> from pprint import pprint
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> r = s.aria2.getOption('1')
    >>> pprint(r)
    {'allow-overwrite': 'false',
     'allow-piece-length-change': 'false',
     'always-resume': 'true',
     'async-dns': 'true',
     ....

aria2.changeOption(gid, options)
    This method changes options of the download denoted by gid dynamically. gid is of type string. options is of type struct. The following options are available for active downloads:

•   bt-max-peers

•   bt-request-peer-speed-limit

•   bt-remove-unselected-file

•   max-download-limit

•   max-upload-limit

    For waiting or paused downloads, in addition to the above options, options listed in Input File subsection are available, except for following options: dry-run, metalink-base-uri, parameterized-uri, pause and piece-length. This method returns "OK" for success.

    JSON-RPC Example

    The following example sets max-download-limit option to "20K" for the download whose GID is "1":

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.changeOption',
    ...                       'params':['1', {'max-download-limit':'10K'}]})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer', u'jsonrpc': u'2.0', u'result': u'OK'}

    XML-RPC Example

    The following example sets max-download-limit option to "20K" for the download whose GID is "1":

    >>> import xmlrpclib
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> s.aria2.changeOption('1', {'max-download-limit':'20K'})
    'OK'

aria2.getGlobalOption()
    This method returns global options. The response is of type struct. Its key is the name of option. The value type is string. Note that this method does not return options which have no default value and have not been set by the command-line options, configuration files or RPC methods. Because global options are used as a template for the options of newly added download, the response contains keys returned by aria2.getOption() method.

aria2.changeGlobalOption(options)
    This method changes global options dynamically. options is of type struct. The following options are available:

•   download-result

•   log

•   log-level

•   max-concurrent-downloads

•   max-download-result

•   max-overall-download-limit

•   max-overall-upload-limit

•   save-cookies

•   save-session

•   server-stat-of

    In addition to them, options listed in Input File subsection are available, except for following options: checksum, index-out, out, pause and select-file.

    Using log option, you can dynamically start logging or change log file. To stop logging, give empty string("") as a parameter value. Note that log file is always opened in append mode. This method returns "OK" for success.

aria2.getGlobalStat()
    This method returns global statistics such as overall download and upload speed. The response is of type struct and contains following keys. The value type is string.

downloadSpeed
    Overall download speed (byte/sec).

uploadSpeed
    Overall upload speed(byte/sec).

numActive
    The number of active downloads.

numWaiting
    The number of waiting downloads.

numStopped
    The number of stopped downloads.

    JSON-RPC Example

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.getGlobalStat'})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer',
     u'jsonrpc': u'2.0',
     u'result': {u'downloadSpeed': u'21846',
                 u'numActive': u'2',
                 u'numStopped': u'0',
                 u'numWaiting': u'0',
                 u'uploadSpeed': u'0'}}

    XML-RPC Example

    >>> import xmlrpclib
    >>> from pprint import pprint
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> r = s.aria2.getGlobalStat()
    >>> pprint(r)
    {'downloadSpeed': '23136',
     'numActive': '2',
     'numStopped': '0',
     'numWaiting': '0',
     'uploadSpeed': '0'}

aria2.purgeDownloadResult()
    This method purges completed/error/removed downloads to free memory. This method returns "OK".

aria2.removeDownloadResult(gid)
    This method removes completed/error/removed download denoted by gid from memory. This method returns "OK" for success.

    JSON-RPC Example

    The following example removes the download result of the download whose GID is "1":

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.removeDownloadResult',
    ...                       'params':['1']})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer', u'jsonrpc': u'2.0', u'result': u'OK'}

    XML-RPC Example

    The following example removes the download result of the download whose GID is "1":

    >>> import xmlrpclib
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> s.aria2.removeDownloadResult('1')
    'OK'

aria2.getVersion()
    This method returns version of the program and the list of enabled features. The response is of type struct and contains following keys.

version
    Version number of the program in string.

enabledFeatures
    List of enabled features. Each feature name is of type string.

    JSON-RPC Example

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.getVersion'})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer',
     u'jsonrpc': u'2.0',
     u'result': {u'enabledFeatures': [u'Async DNS',
                                      u'BitTorrent',
                                      u'Firefox3 Cookie',
                                      u'GZip',
                                      u'HTTPS',
                                      u'Message Digest',
                                      u'Metalink',
                                      u'XML-RPC'],
                 u'version': u'1.11.0'}}

    XML-RPC Example

    >>> import xmlrpclib
    >>> from pprint import pprint
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> r = s.aria2.getVersion()
    >>> pprint(r)
    {'enabledFeatures': ['Async DNS',
                         'BitTorrent',
                         'Firefox3 Cookie',
                         'GZip',
                         'HTTPS',
                         'Message Digest',
                         'Metalink',
                         'XML-RPC'],
     'version': '1.11.0'}

aria2.getSessionInfo()
    This method returns session information. The response is of type struct and contains following key.

sessionId
    Session ID, which is generated each time when aria2 is invoked.

    JSON-RPC Example

    >>> import urllib2, json
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'aria2.getSessionInfo'})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer',
     u'jsonrpc': u'2.0',
     u'result': {u'sessionId': u'cd6a3bc6a1de28eb5bfa181e5f6b916d44af31a9'}}

    XML-RPC Example

    >>> import xmlrpclib
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> s.aria2.getSessionInfo()
    {'sessionId': 'cd6a3bc6a1de28eb5bfa181e5f6b916d44af31a9'}

aria2.shutdown()
    This method shutdowns aria2. This method returns "OK".

aria2.forceShutdown()
    This method shutdowns aria2. This method behaves like aria2.shutdown() except that any actions which takes time such as contacting BitTorrent tracker are skipped. This method returns "OK".

system.multicall(methods)
    This methods encapsulates multiple method calls in a single request. methods is of type array and its element is struct. The struct contains two keys: methodName and params. methodName is the method name to call and params is array containing parameters to the method. This method returns array of responses. The element of array will either be a one-item array containing the return value of each method call or struct of fault element if an encapsulated method call fails.

    JSON-RPC Example

    In the following example, we add 2 downloads. First one is http://example.org/file and second one is file.torrent:

    >>> import urllib2, json, base64
    >>> from pprint import pprint
    >>> jsonreq = json.dumps({'jsonrpc':'2.0', 'id':'qwer',
    ...                       'method':'system.multicall',
    ...                       'params':[[{'methodName':'aria2.addUri',
    ...                                   'params':[['http://example.org']]},
    ...                                  {'methodName':'aria2.addTorrent',
    ...                                   'params':[base64.b64encode(open('file.torrent').read())]}]]})
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    {u'id': u'qwer', u'jsonrpc': u'2.0', u'result': [[u'1'], [u'2']]}

    JSON-RPC also supports Batch request described in JSON-RPC 2.0 Specification:

    >>> jsonreq = json.dumps([{'jsonrpc':'2.0', 'id':'qwer',
    ...                        'method':'aria2.addUri',
    ...                        'params':[['http://example.org']]},
    ...                       {'jsonrpc':'2.0', 'id':'asdf',
    ...                        'method':'aria2.addTorrent',
    ...                        'params':[base64.b64encode(open('file.torrent').read())]}])
    >>> c = urllib2.urlopen('http://localhost:6800/jsonrpc', jsonreq)
    >>> pprint(json.loads(c.read()))
    [{u'id': u'qwer', u'jsonrpc': u'2.0', u'result': u'1'},
     {u'id': u'asdf', u'jsonrpc': u'2.0', u'result': u'2'}]

    XML-RPC Example

    In the following example, we add 2 downloads. First one is http://example.org/file and second one is file.torrent:

    >>> import xmlrpclib
    >>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
    >>> mc = xmlrpclib.MultiCall(s)
    >>> mc.aria2.addUri(['http://example.org/file'])
    >>> mc.aria2.addTorrent(xmlrpclib.Binary(open('file.torrent').read()))
    >>> r = mc()
    >>> tuple(r)
    ('2', '3')

  Error Handling

In JSON-RPC, aria2 returns JSON object which contains error code in code and the error message in message.

In XML-RPC, aria2 returns faultCode=1 and the error message in faultString.

  Options

Same options for --input-file list are available. See Input File subsection for complete list of options.

In the option struct, name element is option name(without preceding --) and value element is argument as string.

  JSON-RPC Example

{'split':'1', 'http-proxy':'http://proxy/'}

  XML-RPC Example

<struct>
  <member>
    <name>split</name>
    <value><string>1</string></value>
  </member>
  <member>
    <name>http-proxy</name>
    <value><string>http://proxy/</string></value>
  </member>
</struct>

header and index-out option are allowed multiple times in command-line. Since name should be unique in struct(many XML-RPC library implementation uses hash or dict for struct), single string is not enough. To overcome this situation, they can take array as value as well as string.

  JSON-RPC Example

{'header':['Accept-Language: ja', 'Accept-Charset: utf-8']}

  XML-RPC Example

<struct>
  <member>
    <name>header</name>
    <value>
      <array>
        <data>
          <value><string>Accept-Language: ja</string></value>
          <value><string>Accept-Charset: utf-8</string></value>
        </data>
      </array>
    </value>
  </member>
</struct>

Following example adds a download with 2 options: dir and header. header option has 2 values, so it uses a list:

>>> import xmlrpclib
>>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
>>> opts = dict(dir='/tmp',
...             header=['Accept-Language: ja',
...                     'Accept-Charset: utf-8'])
>>> s.aria2.addUri(['http://example.org/file'], opts)
'1'

  JSON-RPC using HTTP GET

The JSON-RPC interface also supports request via HTTP GET. The encoding scheme in GET parameters is based on JSON-RPC over HTTP Specification [2008-1-15(RC1)]. The encoding of GET parameters are follows:

/jsonrpc?method=METHOD_NAME&id=ID&params=BASE64_ENCODED_PARAMS

The method and id are always treated as JSON string and their encoding must be UTF-8.

For example, The encoded string of aria2.tellStatus('3') with id='foo' looks like this:

/jsonrpc?method=aria2.tellStatus&id=foo&params=WyIzIl0%3D

The params parameter is Base64-encoded JSON array which usually appears in params attribute in JSON-RPC request object. In the above example, the params is ['3'], therefore:

['3'] --(Base64)--> WyIzIl0= --(Percent Encode)--> WyIzIl0%3D

The JSON-RPC interface supports JSONP. You can specify the callback function in 'jsoncallback' parameter:

/jsonrpc?method=aria2.tellStatus&id=foo&params=WyIzIl0%3D&jsoncallback=cb

For Batch request, method and id parameter must not be specified. Whole request must be specified in params parameter. For example, Batch request:

[{'jsonrpc':'2.0', 'id':'qwer', 'method':'aria2.getVersion'},
 {'jsonrpc':'2.0', 'id':'asdf', 'method':'aria2.tellActive'}]

will be encoded like this:

/jsonrpc?params=W3sianNvbnJwYyI6ICIyLjAiLCAiaWQiOiAicXdlciIsICJtZXRob2QiOiAiYXJpYTIuZ2V0VmVyc2lvbiJ9LCB7Impzb25ycGMiOiAiMi4wIiwgImlkIjogImFzZGYiLCAibWV0aG9kIjogImFyaWEyLnRlbGxBY3RpdmUifV0%3D

  JSON-RPC over WebSocket

JSON-RPC over WebSocket uses same method signatures and response format with JSON-RPC over HTTP. The supported WebSocket version is 13 which is detailed in RFC 6455.

To send a RPC request to the RPC server, send serialized JSON string in Text frame. The response from the RPC server is delivered also in Text frame.

The RPC server will send the notification to the client. The notification is unidirectional, therefore the client which received the notification must not respond to it. The method signature of notification is much like a normal method request but lacks id key. The value associated by the params key is the data which this notification carries. The format of this value varies depending on the notification method. Following notification methods are defined.

aria2.onDownloadStart(event)
    This notification will be sent if a download is started. The event is of type struct and it contains following keys. The value type is string.

gid GID of the download.

aria2.onDownloadPause(event)
    This notification will be sent if a download is paused. The event is the same struct of the event argument of aria2.onDownloadStart() method.

aria2.onDownloadStop(event)
    This notification will be sent if a download is stopped by the user. The event is the same struct of the event argument of aria2.onDownloadStart() method.

aria2.onDownloadComplete(event)
    This notification will be sent if a download is completed. In BitTorrent downloads, this notification is sent when the download is completed and seeding is over. The event is the same struct of the event argument of aria2.onDownloadStart() method.

aria2.onDownloadError(event)
    This notification will be sent if a download is stopped due to error. The event is the same struct of the event argument of aria2.onDownloadStart() method.

aria2.onBtDownloadComplete(event)
    This notification will be sent if a download is completed in BitTorrent (but seeding may not be over). The event is the same struct of the event argument of aria2.onDownloadStart() method.

  Sample XML-RPC Client Code

The following Ruby script adds http://localhost/aria2.tar.bz2 to aria2c operated on localhost with option --dir=/downloads and prints its reponse:

#!/usr/bin/env ruby
require 'xmlrpc/client'
require 'pp'
client=XMLRPC::Client.new2("http://localhost:6800/rpc")
options={ "dir" => "/downloads" }
result=client.call("aria2.addUri", [ "http://localhost/aria2.tar.bz2" ], options)
pp result

If you are a Python lover, you can use xmlrpclib(for Python3.x, use xmlrpc.client instead) to interact with aria2:

import xmlrpclib
from pprint import pprint
s = xmlrpclib.ServerProxy("http://localhost:6800/rpc")
r = s.aria2.addUri(["http://localhost/aria2.tar.bz2"], {"dir":"/downloads"})
pprint(r)

MISC

  Console Readout

While downloading files, aria2 prints the console readout to tell the progress of the downloads. The console readout is like this:

[#1 SIZE:400.0KiB/33.2MiB(1%) CN:1 SPD:115.7KiBs ETA:4m51s]

This section describes what these numbers and strings mean.

#N  N means GID, which is an unique ID for each download.

SIZE
    Completed length and Total length in bytes. If --select-file is used, this is the sum of selected file.

SEEDING
    Share ratio. The client is now seeding. After BitTorrent download finished, SIZE is replaced with SEEDING.

CN  The number of connections the client has established.

SEED
    The number of seeders the client has connected to.

SPD Download speed.

UP  Upload speed and the number of uploaded bytes.

ETA Expected time to finish.

TOTAL SPD
    The sum of download speed for all parallel downloads.

    When aria2 is allocating file space or validating checksum, it additionally prints the their progress:

FileAlloc
    GID, allocated length and total length in bytes.

Checksum
    GID, validated length and total length in bytes.

EXAMPLE

  HTTP/FTP Segmented Download

  Download a file

$ aria2c "http://host/file.zip"

Note
    To stop a download, press Ctrl-C. You can resume the transfer by running aria2c with the same argument in the same directory. You can change URIs as long as they are pointing to the same file.

  Download a file from 2 different HTTP servers

$ aria2c "http://host/file.zip" "http://mirror/file.zip"

  Download a file from 1 host using 2 connections

$ aria2c -x2 -k1M "http://host/file.zip"

  Download a file from HTTP and FTP servers

$ aria2c "http://host1/file.zip" "ftp://host2/file.zip"

  Download files listed in a text file concurrently

$ aria2c -ifiles.txt -j2

Note
    -j option specifies the number of parallel downloads.

  Using proxy

For HTTP:

$ aria2c --http-proxy="http://proxy:8080" "http://host/file"

$ aria2c --http-proxy="http://proxy:8080" --no-proxy="localhost,127.0.0.1,192.168.0.0/16" "http://host/file"

For FTP:

$ aria2c --ftp-proxy="http://proxy:8080" "ftp://host/file"

Note
    See --http-proxy, --https-proxy, --ftp-proxy, --all-proxy and --no-proxy for details. You can specify proxy in the environment variables. See ENVIRONMENT section.

  Proxy with authorization

$ aria2c --http-proxy="http://username:password@proxy:8080" "http://host/file"

$ aria2c --http-proxy="http://proxy:8080" --http-proxy-user="username" --http-proxy-passwd="password" "http://host/file"

  Metalink Download

  Download files with remote Metalink

$ aria2c --follow-metalink=mem "http://host/file.metalink"

  Download using a local metalink file

$ aria2c -p --lowest-speed-limit=4000 file.metalink

Note
    To stop a download, press Ctrl-C. You can resume the transfer by running aria2c with the same argument in the same directory.

  Download several local metalink files

$ aria2c -j2 file1.metalink file2.metalink

  Download only selected files using index

$ aria2c --select-file=1-4,8 file.metalink

Note
    The index is printed to the console using -S option.

  Download a file using a local metalink file with user preference

$ aria2c --metalink-location=jp,us --metalink-version=1.1 --metalink-language=en-US file.metalink

  BitTorrent Download

  Download files from remote BitTorrent file

$ aria2c --follow-torrent=mem "http://host/file.torrent"

  Download using a local torrent file

$ aria2c --max-upload-limit=40K file.torrent

Note
    --max-upload-limit specifies the max of upload rate.

Note
    To stop a download, press Ctrl-C. You can resume the transfer by running aria2c with the same argument in the same directory.

  Download using BitTorrent Magnet URI

$ aria2c "magnet:?xt=urn:btih:248D0A1CD08284299DE78D5C1ED359BB46717D8C&dn=aria2"

Note
    Don't forget to quote BitTorrent Magnet URI which includes & character with single(') or double(") quotation.

  Download 2 torrents

$ aria2c -j2 file1.torrent file2.torrent

  Download a file using torrent and HTTP/FTP server

$ aria2c -Ttest.torrent "http://host1/file" "ftp://host2/file"

Note
    Downloading multi file torrent with HTTP/FTP is not supported.

  Download only selected files using index(usually called selectable download )

$ aria2c --select-file=1-4,8 file.torrent

Note
    The index is printed to the console using -S option.

  Specify output filename

To specify output filename for BitTorrent downloads, you need to know the index of file in torrent file using --show-files option. For example, the output looks like this:

idx|path/length
===+======================
  1|dist/base-2.6.18.iso
   |99.9MiB
---+----------------------
  2|dist/driver-2.6.18.iso
   |169.0MiB
---+----------------------

To save 'dist/base-2.6.18.iso' in '/tmp/mydir/base.iso' and 'dist/driver-2.6.18.iso' in '/tmp/dir/driver.iso', use the following command:

$ aria2c --dir=/tmp --index-out=1=mydir/base.iso --index-out=2=dir/driver.iso file.torrent

  Change the listening port for incoming peer

$ aria2c --listen-port=7000-7001,8000 file.torrent

Note
    Since aria2 doesn't configure firewall or router for port forwarding, it's up to you to do it manually.

  Specify the condition to stop program after torrent download finished

$ aria2c --seed-time=120 --seed-ratio=1.0 file.torrent

Note
    In the above example, the program exits when the 120 minutes has elapsed since download completed or seed ratio reaches 1.0.

  Throttle upload speed

$ aria2c --max-upload-limit=100K file.torrent

  Enable IPv4 DHT

$ aria2c --enable-dht --dht-listen-port=6881 file.torrent

Note
    DHT uses udp port. Since aria2 doesn't configure firewall or router for port forwarding, it's up to you to do it manually.

  Enable IPv6 DHT

$ aria2c --enable-dht6 --dht-listen-port=6881 --dht-listen-addr6=YOUR_GLOBAL_UNICAST_IPV6_ADDR --enable-async-dns6

Note
    If aria2c is not built with c-ares, --enable-async-dns6 is unnecessary. aria2 shares same port between IPv4 and IPv6 DHT.

  Add and remove tracker URI

Removes all tracker announce URIs described in file.torrent and use http://tracker1/announce and http://tracker2/announce instead:

$ aria2c --bt-exclude-tracker="*" --bt-tracker="http://tracker1/announce,http://tracker2/announce" file.torrent

  More advanced HTTP features

  Load cookies

$ aria2c --load-cookies=cookies.txt "http://host/file.zip"

Note
    You can use Firefox/Mozilla/Chromium's cookie file without modification.

  Resume download started by web browsers or another programs

$ aria2c -c -s2 "http://host/partiallydownloadedfile.zip"

  Client certificate authorization for SSL/TLS

$ aria2c --certificate=/path/to/mycert.pem --private-key=/path/to/mykey.pem https://host/file

Note
    The file specified in --private-key must be decrypted. The behavior when encrypted one is given is undefined.

  Verify peer in SSL/TLS using given CA certificates

$ aria2c --ca-certificate=/path/to/ca-certificates.crt --check-certificate https://host/file

  And more advanced features

  Throttle download speed

$ aria2c --max-download-limit=100K file.metalink

  Repair a damaged download

$ aria2c -V file.metalink

Note
    Repairing damaged downloads can be done efficiently when used with BitTorrent or Metalink with chunk checksums.

  Drop connection if download speed is lower than specified value

$ aria2c --lowest-speed-limit=10K file.metalink

  Parameterized URI support

You can specify set of parts:

$ aria2c -P "http://{host1,host2,host3}/file.iso"

You can specify numeric sequence:

$ aria2c -Z -P "http://host/image[000-100].png"

Note
    -Z option is required if the all URIs don't point to the same file, such as the above example.

You can specify step counter:

$ aria2c -Z -P "http://host/image[A-Z:2].png"

  Verify checksum

$ aria2c --checksum=sha-1=0192ba11326fe2298c8cb4de616f4d4140213837 http://example.org/file

  Parallel downloads of arbitrary number of URI,metalink,torrent

$ aria2c -j3 -Z "http://host/file1" file2.torrent file3.metalink

  BitTorrent Encryption

Encrypt whole payload using ARC4:

$ aria2c --bt-min-crypto-level=arc4 --bt-require-crypto=true file.torrent

SEE ALSO

Project Web Site: http://aria2.sourceforge.net/

aria2 Wiki: http://sourceforge.net/apps/trac/aria2/wiki

Metalink Homepage: http://www.metalinker.org/

The Metalink Download Description Format: RFC 5854

COPYRIGHT

Copyright (C) 2006, 2012 Tatsuhiro Tsujikawa

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

In addition, as a special exception, the copyright holders give permission to link the code of portions of this program with the OpenSSL library under certain conditions as described in each individual source file, and distribute linked combinations including the two. You must obey the GNU General Public License in all respects for all of the code used other than OpenSSL. If you modify file(s) with this exception, you may extend this exception to your version of the file(s), but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. If you delete this exception statement from all source files in the program, then also delete it here.