We have a Debian 10 server with Apache2 and PHP-FPM installed.
The problem is that when I try to process multiple requests simultaneously from one client, server doesn't handle it correctly.
For example, I send a request from clientA that may take 60 seconds to proceed, now I send 10 other requests from the same client which are easy to process and would response in less than 1 sec in a normal situation, but they wait until the first request (60sec one) completes and only then they start being processed and giving response. Sometimes, easy requests have been returning error code 504 Timeout because of the heavy process.
Note that while a heavy process from cliantA is being processed, other clients still can send requests, so it's a problem only with the client who is sending the heavy request.
I almost tried nothing because I didn't know what to search and the results I had, just wasn't correct for my problem.
For any other information or configurations you think I need to share, please comment below.
All your help is appreciated.
