# 22. Virtuoso Functions Guide - http

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## http

write to HTTP client or a string output stream
http (in val_expr any, [in stream any]);
Parameters
val_expr – A value expression. May be any scalar expression.
stream – Optional parameter. If omitted or is 0 and the function is executed within a VSP context, the val_expr will be written to the HTTP client. If present and non-zero, val_expr will be written to the specified stream. If non-zero, the value must be a valid stream obtained from function string_output
Description

http writes val_expr to HTTP client or, if parameter stream is given, to the given string output stream.

val_expr may be any scalar object, i.e. string, date or number and will automatically be cast to varchar before further processing. http will print out the string without escapes. http_value uses HTML escapes and http_url URL escapes.

Errors

SQLState | Error Code | Error Text | Description
--- | --- | --- | ---
22023 | HT007 | An interactive blob can't be passed as argument to http |
22023 | HT008 | http requires string, blob, or string session as argument 1 |
37000 | HT006 | http output function outside of http context and no stream specified: %s. |

Examples
HTTP output

Output of various flavours of http. See string_output and string_output_string for examples how to use http to write to streams other than the HTTP output.

    http (' % <b>')     ' <b>
    http_value (' % <b>')   % &lt;b&gt;
    http_url (' % <b>')  +%25+<b>
    http_value (12, 'li')  <li>12</li>

See Also

http_value, http_url, string_output, http_rewrite.