    import BaseHTTPServer, mimetools
    try:
        from cStringIO import StringIO
    except ImportError:
        from StringIO import StringIO
    import threading, socket
    from WebKit.ThreadedAppServer import Handler
    from WebKit.ASStreamOut import ASStreamOut
    from os import getenv
    import time
    import errno

    class HTTPHandler(BaseHTTPServer.BaseHTTPRequestHandler):
        """Handles incoming requests.

        Recreated with every request. Abstract base class.

        """

        # This sends the common CGI variables, except the following:
        # HTTP_CONNECTION, HTTP_KEEP_ALIVE
        # DOCUMENT_ROOT, PATH_TRANSLATED, SCRIPT_FILENAME
        # SERVER_NAME, SERVER_ADMIN, SERVER_SIGNATURE

        def handleRequest(self):
            """Handle a request.

            Actually performs the request, creating the environment and calling
            self.doTransaction(env, myInput) to perform the response.

            """
            self.server_version = 'Webware/' + self._server.version()
            env = {}
            if self.headers.has_key('Content-Type'):
                env['CONTENT_TYPE'] = self.headers['Content-Type']
                del self.headers['Content-Type']
            key = 'If-Modified-Since'
            if self.headers.has_key(key):
                env[key] = self.headers[key]
                del self.headers[key]
            self.headersToEnviron(self.headers, env)
            env['REMOTE_ADDR'], env['REMOTE_PORT'] = map(str, self.client_address)
            env['REQUEST_METHOD'] = self.command
            path = self.path
            if path.find('?') != -1:
                env['REQUEST_URI'], env['QUERY_STRING'] = path.split('?', 1)
            else:
                env['REQUEST_URI'] = path
                env['QUERY_STRING'] = ''
                env['SCRIPT_NAME'] = ''
            env['PATH'] = getenv('PATH', '')
            env['PATH_INFO'] = env['REQUEST_URI']
            env['SERVER_ADDR'], env['SERVER_PORT'] = map(str, self._serverAddress)
            env['SERVER_SOFTWARE'] = self.server_version
            env['SERVER_PROTOCOL'] = self.protocol_version
            env['GATEWAY_INTERFACE'] = 'CGI/1.1'
            myInput = ''
            if self.headers.has_key('Content-Length'):
                myInput = self.rfile.read(int(self.headers['Content-Length']))
            self.doTransaction(env, myInput)

        do_GET = do_POST = do_HEAD = handleRequest
        # These methods are used in WebDAV requests:
        do_OPTIONS = do_PUT = do_DELETE = handleRequest
        do_MKCOL = do_COPY = do_MOVE = handleRequest
        do_PROPFIND = handleRequest

        def headersToEnviron(self, headers, env):
            """Convert headers to environment variables.

            Use a simple heuristic to convert all the headers to
            environmental variables.

            """
            for header, value in headers.items():
                env['HTTP_%s' % (header.upper().replace('-', '_'))] = value
            return env

        def processResponse(self, data):
            """Process response.

            Takes a string (like what a CGI script would print) and
            sends the actual HTTP response (response code, headers, body).

            """
            s = StringIO(data)
            headers = mimetools.Message(s)
            self.doLocation(headers)
            self.sendStatus(headers)
            self.sendHeaders(headers)
            self.sendBody(s)

        def doLocation(self, headers):
            """Process location header.

            If there's a Location header and no Status header,
            we need to add a Status header ourselves.

            """
            if headers.has_key('Location'):
                if not headers.has_key('Status'):
                    # @@ is this the right status header?
                    headers['Status'] = '301 Moved Permanently'

        def sendStatus(self, headers):
            """Send status."""
            if not headers.has_key('Status'):
                status = "200 OK"
            else:
                status = headers['Status']
                del headers['Status']
            pos = status.find(' ')
            if pos == -1:
                code = int(status)
                message = ''
            else:
                code = int(status[:pos])
                message = status[pos:].strip()
            self.send_response(code, message)

        def sendHeaders(self, headers):
            """Send headers."""
            for header in headers.keys():
                for value in headers.getheaders(header):
                    self.send_header(header, value)
            self.end_headers()

        def sendBody(self, bodyFile):
            """Send body."""
            self.wfile.write(bodyFile.read())
            bodyFile.close()

        def log_request(self, code='-', size='-'):
            """Log request."""
            # Set LogActivity instead.
            pass

    class HTTPAppServerHandler(Handler, HTTPHandler):
        """AppServer interface.

        Adapters HTTPHandler to fit with ThreadedAppServer's
        model of an adapter.

        """
        protocolName = 'http'
        settingPrefix = 'HTTP'

        def handleRequest(self):
            """Handle a request."""
            HTTPHandler.__init__(self, self._sock, self._sock.getpeername(), None)

        def doTransaction(self, env, myInput):
            """Process transaction."""
            streamOut = ASStreamOut()
            requestDict = {
                'format': 'CGI',
                'time': time.time(),
                'environ': env,
                'input': StringIO(myInput),
                'requestID': self._requestID,
                }
            self.dispatchRawRequest(requestDict, streamOut)
            try:
                self.processResponse(streamOut._buffer)
                self._sock.shutdown(2)
            except socket.error, e:
                if e[0] == errno.EPIPE: # broken pipe
                    return
                print "HTTPServer: output error:", e # lame

        def dispatchRawRequest(self, requestDict, streamOut):
            """Dispatch the request."""
            transaction = self._server._app.dispatchRawRequest(requestDict, streamOut)
            streamOut.close()
            transaction._application = None
            transaction.die()
            del transaction