mod_proxy_fcgi and WordPress MultiSite
If we have WP MultiSite, default ProxyPassMatch (^/(.*\.php[345]?(/.*)?)$)
will not pass correct script path (for example: example.com/en/wp-admin/load-styles.php)
In logs, error is generated: AH01071: Got error 'Primary script unknown\n'
Solution that works, is to add additional ProxyPassMatch directive before default ProxyPassMatch.
https://wordpress.org/support/topic/multisite-links-broken#post-6395268
Edited by Thom