This thread is resolved. Here is a description of the problem and solution.
Problem:
A bug triggered by specific plugins, producing a 500 error intermittently.
Solution:
We have found out that it is an internal server error triggered by the fact that the .htaccess is altered and /en/ is the rewrite base:
<ifmodule mod_rewrite.c>
RewriteEngine On
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteBase /en/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /en/index.php [L]
</ifmodule>
This occurs primarily on a specific page and happens on every heartbeat. This happens when third-party plugins call the flush_rewrite_rules(true) function too often. This can change the rewrite rules in your .htaccess file and cause issues on your WordPress site. The full explanation can be found here:
https://wpml.org/faq/why-is-htaccess-getting-overwritten-with-the-language-folder-on-my-wpml-website/.
We suggest implementing the workaround on your staging site by adding the following function to the theme's functions.php file.
add_filter('mod_rewrite_rules', 'fix_rewritebase');
function fix_rewritebase($rules){
$home_root = parse_url(home_url());
if ( isset( $home_root['path'] ) ) {
$home_root = trailingslashit($home_root['path']);
} else {
$home_root = '/';
}
$wpml_root = parse_url(get_option('home'));
if ( isset( $wpml_root['path'] ) ) {
$wpml_root = trailingslashit($wpml_root['path']);
} else {
$wpml_root = '/';
}
$rules = str_replace("RewriteBase $home_root", "RewriteBase $wpml_root", $rules);
$rules = str_replace("RewriteRule . $home_root", "RewriteRule . $wpml_root", $rules);
return $rules;
}
Relevant Documentation:
https://wpml.org/faq/why-is-htaccess-getting-overwritten-with-the-language-folder-on-my-wpml-website/
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Last updated by 2 months, 2 weeks ago.
Assisted by: Itamar.
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