On WordPress website hosted on Plesk for Linux server

[Suhitha]

Question: On WordPress website hosted on Plesk for Linux server, pagination buttons in WordPress Admin dashboard do not work as expected

Symptoms

• On a WordPress website hosted on a Plesk for Linux server, pagination buttons in WordPress Admin dashboard do not work as expected.
• HTTP/3 is enabled.
• PHP handler on the domain is set as FPM application served by nginx in the menu Domains > example.com > PHP.
• When WordPress debug mode enabled, the following PHP warning appears on the website:
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  PHP Warning: Undefined array key "HTTP_HOST" in /var/www/vhosts/example.com/httpdocs/wp/wp-admin/includes/misc.php[/li]
[li]

Cause

nginx processing the variable HTTP_HOST differently when serving HTTP/3 requests:
https://trac.nginx.org/nginx/ticket/2281


Resolution
1.Connect to the server via SSH.

2.Create or edit file /etc/nginx/fastcgi.conf and add the following configuration to it:

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[b]fastcgi_param HTTP_HOST $host;[/b]
3.Restart nginx to apply the changes:

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# [b]service nginx restart[/b]