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Why is Plesk using multiple protocols?

After a while browser started to show error like "Website is down or has been moved". Had to remove Protocols h2 http/1.1 to make website work again. 0 errors(just some notices and warnings) in apache error_log :/

//Also tried to stop nginx

Found something in /var/www/vhosts/<domain_name>/logs/proxy_error_log but don't think this is the problem.

Let's check a few things;

[root@plesk ~]# httpd -v
(should come back 2.4.29)
[root@plesk ~]# apachectl -t -D DUMP_MODULES | grep http2
(show come back with 2 results, http2_module and proxy_http2_module)
 
Let's check a few things;

[root@plesk ~]# httpd -v
(should come back 2.4.29)
[root@plesk ~]# apachectl -t -D DUMP_MODULES | grep http2
(show come back with 2 results, http2_module and proxy_http2_module)

This one looks ok.

Code:
[root@host config]# httpd -v
Server version: Apache/2.4.29 (codeit)
Server built:   Nov  3 2017 14:01:58

Code:
[root@host config]# apachectl -t -D DUMP_MODULES | grep http2
 http2_module (shared)
 proxy_http2_module (shared)
 
What about your version of OpenSSL? (1.0.2 or above)

[root@plesk ~]# openssl version
OpenSSL 1.0.2k-fips 26 Jan 2017
 
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