def __call__(timestamp, request):
    """
        Generate a line for the access log.

        @param timestamp: The time at which the request was completed in the
            standard format for access logs.
        @type timestamp: L{unicode}

        @param request: The request object about which to log.
        @type request: L{twisted.web.server.Request}

        @return: One line describing the request without a trailing newline.
        @rtype: L{unicode}
        """
