Question 1

How to deploy Uvicorn with FastAPI in production?

Accepted Answer

Use the uvicorn command with multiple workers via the --workers flag, and consider using a process manager like Gunicorn as a wrapper for better stability. For example: 'uvicorn main:app --workers 4' or 'gunicorn -k uvicorn.workers.UvicornWorker main:app'.

Question 2

Uvicorn vs Hypercorn: which ASGI server is better?

Accepted Answer

Uvicorn is often preferred for its speed with uvloop and simplicity, especially with FastAPI, while Hypercorn supports HTTP/2 and trio runtime. Choose Uvicorn for HTTP/1.1 performance, or Hypercorn for advanced protocols or trio compatibility.

Question 3

Does Uvicorn support WebSockets?

Accepted Answer

Yes, Uvicorn supports WebSockets when installed with the 'standard' extras, which includes the websockets library. However, for custom protocols like wsproto, manual installation is required.

Question 4

How to enable hot reload in Uvicorn during development?

Accepted Answer

Use the --reload flag with the uvicorn command, which leverages watchfiles to monitor code changes and restart the server automatically. Install 'uvicorn[standard]' to ensure watchfiles is available.

Question 5

What frameworks work with Uvicorn?

Accepted Answer

Uvicorn works with any ASGI-compatible framework, including FastAPI, Starlette, Django Channels, and Quart. It's framework-agnostic, so you can build applications with these and run them seamlessly.

Question 6

Setting up SSL/TLS with Uvicorn for secure connections

Accepted Answer

Use the --ssl-keyfile and --ssl-certfile flags with uvicorn to enable HTTPS, or deploy behind a reverse proxy like Nginx for production-grade TLS. Ensure certificates are properly configured for secure deployments.

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