在Render部署Flask SocketIO遇超时及多客户端连接问题求助

我是Render平台的新手，开发了一个简单的Flask WebSocket服务，使用的模块包括flask_socketio、flask，部署时用gunicorn运行脚本。

服务端代码 #

from flask import Flask
from flask_socketio import SocketIO , emit

app = Flask("application")
socket = SocketIO(app)

@app.route("/")
def home():
    return "This is the server side !!"

@socket.on("connect")
def cl_con():
    print("A new client connected !!")

@socket.on("disconnect")
def cl_dis():
    print("A client disconnected !!")
    
@socket.on("message")
def message(data):
    emit("message",data)

if __name__ == "__main__":
    socket.run(app)

客户端代码 #

import socketio as io
import threading as th

name = ""

while (name == ""):
    name = input("Your name :")

def message():
    while True:
        msg = input()
        if (msg == "exit"):
            client.disconnect()
            print("Disconnected !!")
            exit(0)
        else:
            client.emit("message",f"{name}:{msg}")

client = io.Client()

client.connect("https://my_domain_name.onrender.com")
client.emit("message",f"{name} join this chat !!")

t = th.Thread(target=message)
t.daemon = True
t.start()

@client.on("message")
def msg(data):
    print(data)

client.wait()

遇到的问题 #

• 本地客户端能连接服务，但连接10秒后，服务端抛出如下错误，且每5秒重复出现：

[2025-03-07 09:05:06 +0000] [74] [CRITICAL] WORKER TIMEOUT (pid:87)
[2025-03-07 09:05:06 +0000] [87] [ERROR] Error handling request /socket.io/?transport=websocket&EIO=4&sid=E6-m_FkHPBxWcm5MAAAA&t=1741338267.3122072
Traceback (most recent call last):
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/gunicorn/workers/sync.py", line 134, in handle
    self.handle_request(listener, req, client, addr)
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/gunicorn/workers/sync.py", line 177, in handle_request
    respiter = self.wsgi(environ, resp.start_response)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/flask/app.py", line 1536, in __call__
    return self.wsgi_app(environ, start_response)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/flask_socketio/__init__.py", line 42, in __call__
    return super().__call__(environ, start_response)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/engineio/middleware.py", line 63, in __call__
    return self.engineio_app.handle_request(environ, start_response)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/socketio/server.py", line 434, in handle_request
    return self.eio.handle_request(environ, start_response)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/engineio/server.py", line 286, in handle_request
    packets = socket.handle_get_request(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/engineio/socket.py", line 92, in handle_get_request
    return getattr(self, '_upgrade_' + transport)(environ,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/engineio/socket.py", line 151, in _upgrade_websocket
    return ws(environ, start_response)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/engineio/async_drivers/_websocket_wsgi.py", line 15, in __call__
    ret = self.app(self)
          ^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/engineio/socket.py", line 225, in _websocket_handler
    p = websocket_wait()
        ^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/engineio/socket.py", line 156, in websocket_wait
    data = ws.wait()
           ^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/engineio/async_drivers/_websocket_wsgi.py", line 32, in wait
    return self.ws.receive()
           ^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/simple_websocket/ws.py", line 96, in receive
    if not self.event.wait(timeout=timeout):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/threading.py", line 629, in wait
    signaled = self._cond.wait(timeout)
               ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/threading.py", line 327, in wait
    waiter.acquire()
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/gunicorn/workers/base.py", line 204, in handle_abort
    sys.exit(1)
SystemExit: 1

• 尝试连接第二个客户端时，该客户端触发超时错误！

恳请各位提供帮助。

内容的提问来源于stack exchange，提问作者International programmer