Using ApacheBenchmark:
Download link: https://stackoverflow.com/a/68946005/10919965
abs.exe for https
ab.exe for http

-r              Don't exit on socket receive errors.
-n requests     Number of requests to perform
-c concurrency  Number of multiple requests to make at a time

10 requests by 5 clients cmd:
abs -r -n 10 -c 5 https://your.http/server
more stress, 2000 requests by 200 clients cmd:
abs -r -n 2000 -c 200 https://your.http/server

In the result, forcus on:
Complete requests, Time taken for tests, Requests per second.


https://torbjornzetterlund.com/performance-testing-your-wordpress-website/#gsc.tab=0
https://iximiuz.com/en/posts/flask-gevent-tutorial/