ERROR: Exception in ASGI application websockets

[zhi35]

Describe the bug

I installed it locally, and after the installation is completed, I started it using the bellow command and reported the error. I asked my friends and they also made the same mistake

langflow --log-level debug

Output log of the console

[11:37:23] INFO     [11:37:23] - INFO - Logger set up with log level: 10(debug)                                 logger.py:28
           INFO     [11:37:23] - INFO - Log file: logs/langflow.log                                             logger.py:30
INFO:     Started server process [36465]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     Uvicorn running on http://127.0.0.1:7860 (Press CTRL+C to quit)
DEBUG:    = connection is CONNECTING
DEBUG:    < GET /chat/ HTTP/1.1
DEBUG:    < host: 127.0.0.1:7860
DEBUG:    < connection: Upgrade
DEBUG:    < pragma: no-cache
DEBUG:    < cache-control: no-cache
DEBUG:    < user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36
DEBUG:    < upgrade: websocket
DEBUG:    < origin: http://127.0.0.1:7860
DEBUG:    < sec-websocket-version: 13
DEBUG:    < accept-encoding: gzip, deflate, br
DEBUG:    < accept-language: zh-CN,zh;q=0.9,en;q=0.8
DEBUG:    < cookie: access-token=vuH9UEGn-sD6mIzAbn8UrQ; access-token-unsecure=vuH9UEGn-sD6mIzAbn8UrQ
DEBUG:    < sec-websocket-key: I6EU4VtdimSQgm1qfcCOVw==
DEBUG:    < sec-websocket-extensions: permessage-deflate; client_max_window_bits
ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/uvicorn/protocols/websockets/websockets_impl.py", line 238, in run_asgi
    result = await self.app(self.scope, self.asgi_receive, self.asgi_send)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/uvicorn/middleware/proxy_headers.py", line 78, in __call__
    return await self.app(scope, receive, send)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/fastapi/applications.py", line 271, in __call__
    await super().__call__(scope, receive, send)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/starlette/applications.py", line 118, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/starlette/middleware/errors.py", line 149, in __call__
    await self.app(scope, receive, send)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/starlette/middleware/cors.py", line 76, in __call__
    await self.app(scope, receive, send)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/starlette/middleware/exceptions.py", line 79, in __call__
    raise exc
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/starlette/middleware/exceptions.py", line 68, in __call__
    await self.app(scope, receive, sender)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/fastapi/middleware/asyncexitstack.py", line 21, in __call__
    raise e
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/fastapi/middleware/asyncexitstack.py", line 18, in __call__
    await self.app(scope, receive, send)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/starlette/routing.py", line 706, in __call__
    await route.handle(scope, receive, send)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/starlette/routing.py", line 443, in handle
    await self.app(scope, receive, send)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/starlette/staticfiles.py", line 96, in __call__
    assert scope["type"] == "http"
AssertionError
DEBUG:    > HTTP/1.1 101 Switching Protocols
DEBUG:    > Upgrade: websocket
DEBUG:    > Connection: Upgrade
DEBUG:    > Sec-WebSocket-Accept: 9A3iAH/t+Z9wBhePk6Yk8kIb+sI=
DEBUG:    > Sec-WebSocket-Extensions: permessage-deflate
DEBUG:    > date: Wed, 10 May 2023 03:37:23 GMT
DEBUG:    > server: uvicorn
INFO:     connection open
DEBUG:    = connection is OPEN
DEBUG:    = connection is CLOSING
DEBUG:    > CLOSE 1000 (OK) [2 bytes]
DEBUG:    = connection is CLOSED
DEBUG:    ! failing connection with code 1006
DEBUG:    x half-closing TCP connection
DEBUG:    ! failing connection with code 1006
ERROR:    closing handshake failed
Traceback (most recent call last):
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/protocol.py", line 959, in transfer_data
    message = await self.read_message()
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/protocol.py", line 1029, in read_message
    frame = await self.read_data_frame(max_size=self.max_size)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/protocol.py", line 1104, in read_data_frame
    frame = await self.read_frame(max_size)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/protocol.py", line 1161, in read_frame
    frame = await Frame.read(
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/framing.py", line 68, in read
    data = await reader(2)
  File "/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/asyncio/streams.py", line 721, in readexactly
    raise exceptions.IncompleteReadError(incomplete, n)
asyncio.exceptions.IncompleteReadError: 0 bytes read on a total of 2 expected bytes

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/server.py", line 248, in handler
    await self.close()
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/protocol.py", line 766, in close
    await self.write_close_frame(Close(code, reason))
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/protocol.py", line 1232, in write_close_frame
    await self.write_frame(True, OP_CLOSE, data, _state=State.CLOSING)
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/protocol.py", line 1205, in write_frame
    await self.drain()
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/protocol.py", line 1194, in drain
    await self.ensure_open()
  File "/Users/ruihai/Library/Python/3.9/lib/python/site-packages/websockets/legacy/protocol.py", line 935, in ensure_open
    raise self.connection_closed_exc()
websockets.exceptions.ConnectionClosedError: sent 1000 (OK); no close frame received
INFO:     connection closed

I am using a Mac system

13.0.1 (22A400)

Version of my Python package： fastapi 0.92.0 websocket-client 1.5.1 uvicorn 0.20.0 websockets 11.0.3

[ogabrielluiz]

Hey, @rui-hai. Thanks for opening this issue.

It seems this isn't related to LangFlow. Have you tried upgrading it to the latest version? Could you try using a different Python version like 3.10 or 3.11?

[merrickfox]

Hi all, I do think this is actually a Langflow issue. Somehow tabs can get into a bad state and can't establish a WS connection

Video of the issue if it helps.

https://github.com/logspace-ai/langflow/assets/5541893/e1d11428-d776-425c-a22b-f28cf4802aa5

The good news is it seems like a quick workaround is just opening a new tab!

[zhi35]

@merrickfox cool , I tried the method of creating a new tab, which is indeed possible, but it is still a bug，please fix @ogabrielluiz

[ogabrielluiz]

Yeah. We'll push a release today that fixes this. Thanks!

[zhi35]

@ogabrielluiz In response to my issue, I attempted to upgrade Python 3.9 to Python 3.11.3 and the issue was resolved. After startup, no more errors are reported in console. So please indicate the version that Langflow needs to rely on to avoid unexpected issues caused by Python versions. Thank you.

Now a new problem has arisen. Seeing that someone has already raised the same error report：

https://github.com/logspace-ai/langflow/issues/268

Error building node OpenAI: 2 validation errors for OpenAI allowed_special unhashable type: 'list' (type=type_error) allowed_special instance of Set expected (type=type_error.arbitrary_type; expected_arbitrary_type=Set)

[Dogtiti]

When I switch tabs, I get the above error. I can confirm that my 7860 service is already running and that I'm using the latest version of Python.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[qq1499412503]

See #298 for ws hard code error

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.