Failed with TypeError

[yhojann-cl]

When use Flask and Flask-SocketIo says an error:

app = Flask(...)
socketio = SocketIO(app)

# .. routes and blueprints without socket routes

socketio.run(app=app, host='127.0.0.1', port=9999)

Traceback (most recent call last):
  File "/home/.../.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 999, in handle_one_response
    self.run_application()
  File "/home/.../.local/lib/python3.8/site-packages/geventwebsocket/handler.py", line 82, in run_application
    self.process_result()
  File "/home/.../.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 932, in process_result
    self.write(data)
  File "/home/.../.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 779, in write
    self._write_with_headers(data)
  File "/home/.../.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 800, in _write_with_headers
    self._write(data)
  File "/home/.../.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 762, in _write
    self._sendall(data)
  File "/home/.../.local/lib/python3.8/site-packages/gevent/pywsgi.py", line 736, in _sendall
    self.socket.sendall(data)
  File "/home/.../.local/lib/python3.8/site-packages/gevent/_socketcommon.py", line 698, in sendall
    data_memory = _get_memory(data)
  File "src/gevent/_greenlet_primitives.py", line 98, in gevent._gevent_c_greenlet_primitives.get_memory
  File "src/gevent/_greenlet_primitives.py", line 121, in gevent._gevent_c_greenlet_primitives.get_memory
  File "src/gevent/_greenlet_primitives.py", line 109, in gevent._gevent_c_greenlet_primitives.get_memory
TypeError: memoryview: a bytes-like object is required, not 'str'
2021-03-08T01:38:48Z {'REMOTE_ADDR': '127.0.0.1', 'REMOTE_PORT': '32906', 'HTTP_HOST': '127.0.0.1', (hidden keys: 21)} failed with TypeError

I test using netcat:

$ ncat --crlf -v 127.0.0.1 9999
Ncat: Version 7.80 ( https://nmap.org/ncat )
Ncat: Connected to 127.0.0.1:9999.
GET / HTTP/1.1
Host: 127.0.0.1
Connection: Upgrade
Upgrade: websocket
Sec-WebSocket-Accept: 0
Origin: http://127.0.0.1

HTTP/1.1 426 Upgrade Required
Sec-WebSocket-Version: 13, 8, 7
Date: Mon, 08 Mar 2021 01:38:48 GMT
Content-Length: 37

Or with curl same issue:

$ curl -i -N -H "Connection: Upgrade" -H "Upgrade: websocket" -H "Host: 127.0.0.1" -H "Origin:http://127.0.0.1:9999" http://127.0.0.1:9999/
HTTP/1.1 426 Upgrade Required
Sec-WebSocket-Version: 13, 8, 7
Date: Mon, 08 Mar 2021 01:35:39 GMT
Content-Length: 37

curl: (18) transfer closed with 37 bytes remaining to read

But with echo.websocket.org works fine:

$ curl -i -N -H "Connection: Upgrade" -H "Upgrade: websocket" -H "Host: echo.websocket.org" -H "Origin: http://www.websocket.org" http://echo.websocket.org
HTTP/1.1 101 Web Socket Protocol Handshake
Access-Control-Allow-Credentials: true
Access-Control-Allow-Headers: content-type
Access-Control-Allow-Headers: authorization
Access-Control-Allow-Headers: x-websocket-extensions
Access-Control-Allow-Headers: x-websocket-version
Access-Control-Allow-Headers: x-websocket-protocol
Access-Control-Allow-Origin: http://www.websocket.org
Connection: Upgrade
Date: Mon, 08 Mar 2021 01:46:41 GMT
Server: Kaazing Gateway
Upgrade: WebSocket
WebSocket-Location: ws://echo.websocket.org/
WebSocket-Origin: http://www.websocket.org

In the code using a simple Flask app and SocketIO wrapper. In StackOverflow says the problem is a incompatibility with python3: https://stackoverflow.com/questions/38269696/python-flask-socketio-typeerror-a-bytes-like-object-is-required-not-str :

I think you use python3 with the gevent and gevent-websocket plugin. gevent-websocket does not support python3 yet.

But in the pip package says the module is for python3.

[miguelgrinberg]

First of all you are using a WebSocket client to test this, not a Socket.IO client (they're different). Second, you are connecting to the root URL of your web server, not to the Socket.IO endpoint.

I recommend you test your server with a Socket.IO client.

[yhojann-cl]

You're right, with a socket.io javascript client it works fine, but it would still be nice if the server doesn't show stub or code debugging when someone sends a manual websocket request.

[miguelgrinberg]

@WHK102 Reread what I said above. You were sending a WebSocket request to the root URL of your server. That has nothing to do with Socket.IO. or this package. You can see in the stack trace that the error comes from gevent, not from this package.