FastAPI deployment: Can Uvicorn and Gunicorn be used together, and can it still remain asynchronous?

FastAPI application deployment: efficient asynchronous collaboration between Uvicorn and Gunicorn

FastAPI applications are usually deployed directly using Uvicorn because it is an efficient ASGI server. However, deployment in combination with Gunicorn is also a common and recommended way, which mainly takes advantage of Gunicorn's process management advantages to improve Uvicorn's performance and stability. This article will answer questions about whether the combination of Uvicorn and Gunicorn in FastAPI applications will affect asynchronous processing capabilities.

Some people may wonder: Uvicorn is an ASGI server, and Gunicorn is a WSGI server. Will the combination of the two cause the asynchronous features of Uvicorn to fail? And Uvicorn itself also supports running as a WSGI server.

In fact, this combination is not a confusing use of the two servers, but a strategy to give full play to their respective strengths. As a process manager, Gunicorn is responsible for starting and managing multiple Uvicorn worker processes. Each worker process is an independent Uvicorn instance and continues to run the ASGI server, thus retaining its asynchronous processing capabilities intact. Gunicorn is only responsible for process management and load balancing, and real request processing is still efficiently completed by Uvicorn asynchronous mechanism.

Therefore, the conclusion is that even if deployed in conjunction with Gunicorn, the asynchronous features of Uvicorn will not be affected in any way.

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