如何为客户端设置子策略列表(Twisted)

大家好,

我创建了一个客户端和一个服务器来通过WebSocket进行通信。Twisted库用于WebSocket,最终我将从客户端向服务器发送GraphQL字符串。

然而,我得到一个错误,说明:

failing WebSocket opening handshake ('subprotocol selected by server (graphql-ws) not in subprotocol list requested by client ([])')

下面是我创建的示例代码:

服务器py公司

class MyServerProtocol(WebSocketServerProtocol):

  def onConnect(self, request):
    custom_header = {}
    if request.headers['sec-websocket-key']:
      custom_header['sec-websocket-protocol'] = 'graphql-ws'
    return (None, custom_header)

  def onOpen(self):
    print "Websocket connection open"

  def onMessage(self, payload, isBinary):
    # Handle GraphQL query string here
    try:
      parsed_message = json.loads(payload)
    except Exception as exp:
      logger.error('Could not parse websocket payload', exc_info=True)
      self.sendClose()
      return 1

  def onClose(self, wasClean, code, reason):
    print("WebSocket connection closed: {0}".format(reason))

客户py公司

class MyClientProtocol(WebSocketClientProtocol):

  def onConnect(self, response):
    response.protocol = 'graphql-ws'

  def onOpen(self):
    print "Websocket connection open"

  def onMessage(self, payload, isBinary):
    if isBinary:
        print("Binary message received: {0} bytes".format(len(payload)))
    else:
        print("Text message received: {0}".format(payload.decode('utf8')))

  def onClose(self, wasClean, code, reason):
    print("WebSocket connection closed: {0}".format(reason))

有人知道如何在客户端设置子程序列表吗?任何帮助都将不胜感激。

谢谢

布瑞恩