Uvicorn

Uvicorn is a lightning-fast "ASGI" server.

It runs asynchronous Python web code in a single process.

Gunicorn

You can use Gunicorn to manage Uvicorn and run multiple of these concurrent processes.

That way, you get the best of concurrency and parallelism.

Uvicorn是单进程的ASGI server，
而Gunicorn是可以管理运行多个Uvicorn，也以达到并发与并行的最好效果。