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BrokenResourceError

See original GitHub issue

First Check

I added a very descriptive title to this issue.
I used the GitHub search to find a similar issue and didn’t find it.
I searched the FastAPI documentation, with the integrated search.
I already searched in Google “How to X in FastAPI” and didn’t find any information.
I already read and followed all the tutorial in the docs and didn’t find an answer.
I already checked if it is not related to FastAPI but to Pydantic.
I already checked if it is not related to FastAPI but to Swagger UI.
I already checked if it is not related to FastAPI but to ReDoc.

Commit to Help

I commit to help with one of those options 👆

Example Code

app.py

import time
import uvicorn
from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware


app = FastAPI()


@app.middleware("http")
async def middleware(request: Request, call_next):
    return await call_next(request)


@app.get("/")
def read_root():
    time.sleep(4)
    return {"Hello": "World"}


if __name__ == "__main__":
    uvicorn.run(app="app:app", port=8000)

script.py

import requests as requests

r = requests.get(f"http://127.0.0.1:8000", timeout=2)

Description

If you trigger script.py, error will appear. After upgrade fastapi to 0.70.0 In some requests in our application its apearing this error. So what we can do? What is problem?

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "venv/lib/python3.8/site-packages/uvicorn/protocols/http/httptools_impl.py", line 398, in run_asgi
    result = await app(self.scope, self.receive, self.send)
  File "venv/lib/python3.8/site-packages/uvicorn/middleware/proxy_headers.py", line 45, in __call__
    return await self.app(scope, receive, send)
  File "venv/lib/python3.8/site-packages/fastapi/applications.py", line 208, in __call__
    await super().__call__(scope, receive, send)
  File "venv/lib/python3.8/site-packages/starlette/applications.py", line 112, in __call__
    await self.middleware_stack(scope, receive, send)
  File "venv/lib/python3.8/site-packages/starlette/middleware/errors.py", line 181, in __call__
    raise exc
  File "venv/lib/python3.8/site-packages/starlette/middleware/errors.py", line 159, in __call__
    await self.app(scope, receive, _send)
  File "venv/lib/python3.8/site-packages/starlette/middleware/base.py", line 57, in __call__
    task_group.cancel_scope.cancel()
  File "venv/lib/python3.8/site-packages/anyio/_backends/_asyncio.py", line 567, in __aexit__
    raise exceptions[0]
  File "venv/lib/python3.8/site-packages/starlette/middleware/base.py", line 30, in coro
    await self.app(scope, request.receive, send_stream.send)
  File "venv/lib/python3.8/site-packages/starlette/exceptions.py", line 82, in __call__
    raise exc
  File "venv/lib/python3.8/site-packages/starlette/exceptions.py", line 71, in __call__
    await self.app(scope, receive, sender)
  File "venv/lib/python3.8/site-packages/starlette/routing.py", line 656, in __call__
    await route.handle(scope, receive, send)
  File "venv/lib/python3.8/site-packages/starlette/routing.py", line 259, in handle
    await self.app(scope, receive, send)
  File "venv/lib/python3.8/site-packages/starlette/routing.py", line 64, in app
    await response(scope, receive, send)
  File "venv/lib/python3.8/site-packages/starlette/responses.py", line 139, in __call__
    await send({"type": "http.response.body", "body": self.body})
  File "venv/lib/python3.8/site-packages/starlette/exceptions.py", line 68, in sender
    await send(message)
  File "venv/lib/python3.8/site-packages/anyio/streams/memory.py", line 205, in send
    raise BrokenResourceError
anyio.BrokenResourceError