def initiate_upgrade_connection(self, headers, path):<EOL>
if self.client:<EOL><INDENT>raise LocalProtocolError(<EOL>"<STR_LIT>"<EOL>)<EOL><DEDENT>upgrade_request = h11.Request(method=b"<STR_LIT:GET>", target=path, headers=headers)<EOL>h11_client = h11.Connection(h11.CLIENT)<EOL>self.receive_data(h11_client.send(upgrade_request))<EOL>
Initiate an upgrade connection.

        This should be used if the request has already be received and
        parsed.