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Example Code

from fastapi import Depends, FastAPI,APIRouter,Request, WebSocket



def my_dependency(request: Request):
    print("called_my_dependency")
    request.state.my_var = "my_var"


app = FastAPI(
    dependencies=[Depends(my_dependency)]
)

def get_test(request: Request):
    print(request.state.my_var)
    return request.state.my_var

async def ws_test(websocket: WebSocket):
    print(websocket.state.my_var)



app.add_api_route('/get',get_test)
app.add_api_websocket_route('/ws',ws_test)

Description

Running the code above and sending a get request to /get yields:

$ curl 127.0.0.1:8000/get | jq
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100     8  100     8    0     0   4672      0 --:--:-- --:--:-- --:--:--  8000
"my_var"

It works fine my_dependency function runs

Trying to connect to /ws endpoint on the other hand throws an error:

$ wscat --connect 127.0.0.1:8000/ws
error: Unexpected server response: 500

From the server's output it's visible my_var can't be found because my_dependency doesn't run.

AttributeError: 'State' object has no attribute 'my_var'

I don't know if it's intended or a bug but, I would expect it to run on the websocket connection as well and be able to access the state variables on the request.

I have also tried it with APIRouter and the results are the same.

Operating System

Linux

Operating System Details

No response

FastAPI Version

0.78.0

Python Version

Python 3.10.4

Additional Context

No response