WARNING: Unsupported upgrade request.

use fastapi I wrote an interface , then java send out post request ,fastapi The interface of always reports this error , and java The client also does not receive the return message

google For a long time , The most popular thing is that you need to reinstall uvicorn

But this does not solve the problem in my project
The final discovery is java Use http2 Requested , and fastapi With uvicorn start-up ,Uvicorn currently only supports HTTP/1.1 and WebSockets

At the moment , There are two ways to solve
Method 1 ：fastapi The interface of is upgraded to http2
Method 2 ：java Appoint http edition