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Example Code

importtimefromtypingimportCallable,AwaitableimportuvicornfromfastapiimportFastAPIfromsqlalchemyimportcreate_enginefromsqlalchemy.ormimportsessionmaker,declarative_basefromstarlette.requestsimportRequestfromstarlette.responsesimportResponseSQLALCHEMY_DATABASE_URL="postgresql://user:password@postgresserver/db"engine=create_engine(SQLALCHEMY_DATABASE_URL)SessionLocal=sessionmaker(autocommit=False,autoflush=False,bind=engine)Base=declarative_base(bind=engine)app=FastAPI()classExceptionHandlerMiddleware:asyncdef__call__(self,request:Request,call_next:Callable[[Request],Awaitable[Response]],    )->Response:try:returnawaitcall_next(request)exceptExceptionasexc:print(exc)app.middleware('http')(ExceptionHandlerMiddleware())@app.middleware("http")asyncdefdb_session_middleware(request:Request,call_next):response=Response("Internal server error",status_code=500)try:request.state.db=SessionLocal()response=awaitcall_next(request)finally:request.state.db.close()returnresponse@app.get('/')deftest():time.sleep(2)return {'message':'hello'}if__name__=='__main__':uvicorn.run('example:app',reload=True,    )

Description

We are using the db session middleware exactly as describedhere in combination with a custom http exception middleware. When a client is disconnecting from us early we get spammed with a bunch ofNo response returned errors from starlette.

How to reproduce:

Open browser and call the endpoint/
Close the window before the request completes.
You will see that AnyIO raises aEndOfStream error which ends up being propogated as aRuntime Error with the message asNo response returned

Operating System

Linux, macOS

Operating System Details

No response

FastAPI Version

0.73.0

Python Version

Python 3.9.6

Additional Context

SQLAlchemy==1.4.31