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add_action('template_redirect', 'theme_add_last_modified_header'); function theme_add_last_modified_header($headers) { global $post; if(isset($post) && isset($post->post_modified)){ $post_mod_date=date("D, d M Y H:i:s",strtotime($post->post_modified)); header('Last-Modified: '.$post_mod_date.' GMT'); } } This ...


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%3F is used for ? and can be a result of urlencode function. Some plugin may use the urlencode php function to encode instead of WordPress esc_url() Troubleshoot Method Open the complete website project in some editor which have find in files feature. Find if any %3F is present in code files. There may be a possibility of manual entry by any plugin ...


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It turns out that the folder wp-content/mu-plugins, for whatever reason, didn't contain plugins, but instead a dump of broken copies of most pages on the site, as well as an outdated copy of the entire public_html directory, with another plugins folder nested inside of it, etc! How that happened is beyond me, but simply removing the entire folder corrected ...


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It is resolved now, it was caused by an .htaccess file placed in the uploads folder


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