websocket\u connect如何传递配置的AsyncHTTPClient以便可以指定代理?

似乎可以通过 AsyncHTTPClient.configure("tornado.curl_httpclient.CurlAsyncHTTPClient") 但是在哪里呢?

@tornado.gen.coroutine
def open(self, proxy=None):
    proxy_host, proxy_port, proxy_username, proxy_password = parse_proxy_dict(proxy)
    connection_request = HTTPRequest(
        url=self.URL, proxy_host=proxy_host, proxy_port=proxy_port,
        proxy_username=proxy_username, proxy_password=proxy_password)
    try:
        self.connection = yield websocket_connect(connection_request)
        self.on_open()
        while True:
            msg = yield self.connection.read_message()
            if msg is None:
                self.on_close()
                break
            yield self.on_message(msg)
    except (Exception, KeyboardInterrupt, SystemExit) as error:
        self.on_error(error)

ws-on\u错误:不支持代理\u主机