uvicorn
Debug FastAPI application in VSCode
Try this configuration. { “name”: “Python: Module”, “type”: “python”, “request”: “launch”, “module”: “uvicorn”, “args”: [“src.main:app”,”–reload”] }
Is there a way to kill uvicorn cleanly?
That’s because you’re running uvicorn as your only server. uvicorn is not a process manager and, as so, it does not manage its workers life cycle. That’s why they recommend running uvicorn using gunicorn+UvicornWorker for production. That said, you can kill the spawned workers and trigger it’s shutdown using the script below: $ kill $(pgrep … Read more
is there a difference between running fastapi from uvicorn command in dockerfile and from pythonfile?
Update (on 2022-12-31) As an update from @Marcelo Trylesinski, from uvicorn v 0.19.0, the –debug flag was removed (Ref #1640). No, there is no difference. The commadline run method (uvicorn app.main:app) and executing the app.py using python command (python app.py) are the same. Both methods are calling the uvicorn.main.run(…) function under the hood. In other … Read more
Gunicorn gevent workers vs Uvicorn ASGI
Gunicorn has a pre-fork worker model A pre-fork worker model basically means a master creates forks which handle each request. A fork is a completely separate *nix process (Source). Uvicorn is a ASGI server running uvloop Python async needs a event loop for it to use it’s async features. And uvloop is an alternative to … Read more
Django 3.x – which ASGI server (Uvicorn vs. Daphne)
Simple Answer: Since you’ve used gunicorn before and you’re familiar with it, go with uvicorn, specially since it should be used as a gunicorn worker in production. If you have no experience with it, then I would suggest daphne. Both will do the job on a simple project, and the performance seems to be equal. … Read more
FastAPI redirection for trailing slash returns non-ssl link
This is because your application isn’t trusting the reverse proxy’s headers overriding the scheme (the X-Forwarded-Proto header that’s passed when it handles a TLS request). There’s a few ways we can fix that: If you’re running the application straight from uvicorn server, try using the flag –forwarded-allow-ips ‘*’. If you’re running gunicorn you can set … Read more
How to do multiprocessing in FastAPI
async def endpoint You could use loop.run_in_executor with ProcessPoolExecutor to start function at a separate process. @app.post(“/async-endpoint”) async def test_endpoint(): loop = asyncio.get_event_loop() with concurrent.futures.ProcessPoolExecutor() as pool: result = await loop.run_in_executor(pool, cpu_bound_func) # wait result def endpoint Since def endpoints are run implicitly in a separate thread, you can use the full power of modules … Read more
FastAPI throws an error (Error loading ASGI app. Could not import module “api”)
TL;DR Add the directory name in front of your filename uvicorn src.main:app or cd into that directory cd src uvicorn main:app Long Answer It happens because you are not in the same folder with your FastAPI app instance more specifically: Let’s say i have an app-tree like this; my_fastapi_app/ ├── app.yaml ├── docker-compose.yml ├── src … Read more