Hi, I have a debian 9 server with http2 mod enabled, but it has no effect because the mpm-prefork module is enabled. Problem is, I can't disable it (and enable mpm-event for instance): everytime Apache restart, prefork is enabled. If I force to remove it by deleting the "mods-available" link, Apache2 does not start. I know that to use mpm-event or worker, you need to use PHP-FPM. This is installed but I don't know how to configure it to have it working. Thanks in advance for any help.
I made some progress: PHP-FPM is enabled for the server and the virtual host mod_php (at least I guess that what php7 module is) is disabled mpm-prefork is disabled and mpm-worker is enabled (if mpm-event is enabled instead, Apache does not start) proxy_fcgi is enabled http2 is enabled The website works normally and confirm that it's running with fpm-fcgi but it's still in http/1.1 so I guess I'm still missing something.
If I remember correctly, your vhost need to specify the use of http2. Did you have it in your vhost? Edited: Do check - https://httpd.apache.org/docs/2.4/howto/http2.html
It is specified at the server level and also at the vhost level. Actually it turned out that the problem lies at the browser level: it seems that none of the browsers on Mac I'm using (Safari 11, Firefox 57 and Chrome 63) support http/2 correctly, while Chrome 63 on Windows 10 does! So when you run some tests, like Lighthouse for instance, you get different results depending on the platform: I get a 100 % result on Windows and a 88 % on Mac! I learned something but what a waste of time! Thanks for your suggestion anyway.
Oh... So you were testing it via browsers in Mac. No wonder. I would prefer to test it via websites instead, something like https://tools.keycdn.com/http2-test or https://http2.pro/ or https://cdnsun.com/knowledgebase/tools/http2-support-test.
