Fastapi: Deployment via uvicorn fails: TypeError: call() missing 2 required positional arguments: 'receive' and 'send'

Created on 20 Dec 2019 · 7Comments · Source: tiangolo/fastapi

I'm trying to run the First Steps example from the documentation and get the following error:

$ uvicorn main:app --host 0.0.0.0 --port 5000
INFO: Started server process [3712]
INFO: Uvicorn running on http://0.0.0.0:5000 (Press CTRL+C to quit)
ERROR: Exception in ASGI application
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/uvicorn/protocols/http/httptools_impl.py", line 388, in > run_asgi
asgi = app(self.scope)
TypeError: __call__() missing 2 required positional arguments: 'receive' and 'send'
INFO: ('192.168.10.102', 1092) - "GET / HTTP/1.1" 500

fastapi 0.45.0

Any suggestions?

Source

potem

Most helpful comment

File "/root/FastApiTest/lib/python3.6/site-packages/hypercorn/asgi/h11.py", line 107, in handle_asgi_app
asgi_instance = self.app(self.scope)
TypeError: __call__() missing 2 required positional arguments: 'receive' and 'send'

I am using hypercorn, I don`t know what to do, is this some sort of bug or what? the API calls returns empty page with 500 error

AlinaSec on 7 Sep 2020

👍2

All 7 comments

Hypercorn seems to run just fine, this is uvicorn related. Any info on this though?

potem on 20 Dec 2019

It might be a uvicorn version issue -- could you let us know what versiosn of uvicorn you are using?

If it isn't a version issue, a minimal reproducible example would also make it a lot easier to verify/work on the problem.

dmontagu on 30 Dec 2019

👍1

Code:

from fastapi import FastAPI

app = FastAPI()

@app.get("/")
async def root():
    return {"message": "Hello World"}

uvicorn version: 0.3.24-1 (buster stable).

potem on 20 Jan 2020

upgrade uvicorn, latest is 0.11, this should solve your issue
generally speaking you'll get a lot of issues using distrib packages,
especially on stable, and more than that on fast-paced development
packages, prefer a virtual env.

On Mon, Jan 20, 2020 at 12:36 PM Tom Petri notifications@github.com wrote:

Code:
from fastapi import FastAPI

app = FastAPI()

@app.get("/")
async def root():
return {"message": "Hello World"}

uvicorn version: 0.3.24-1 (which is on buster stable).

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