A site I manage has been having intermittent issues lately that appear to be caused (at least in part) by WP Super Cache. So far, what I’ve been able to determine is below… has anyone experienced this before or have any suggestions for fixes?
# Issue Description
Certain pages appear to be missing CSS while visiting the site logged out.
Looking at the network inspector in the browser, it’s evident that **some CSS and JS files are being blocked as mixed content because they’re being served over HTTP instead of HTTPS, despite the site being configured to force HTTPS**.
Clearing the cache immediately fixes the issue (temporarily).
The issue will not present itself for weeks, then seemingly randomly re-occur.
The issue does not seem to occur (as far as I can tell) when WP Super Cache is in “Simple” mode.
The site does not have any issues with mixed content or content being served over HTTP outside of this intermittent issue.
# WP Super Cache Configuration
Set to “Expert” mode. These default rules are added into .htaccess for faster caching:
# BEGIN WPSuperCache
# The directives (lines) between “BEGIN WPSuperCache” and “END WPSuperCache” are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
#If you serve pages from behind a proxy you may want to change ‘RewriteCond %{HTTPS} on’ to something more sensible
AddDefaultCharset UTF-8
RewriteCond %{REQUEST_URI} !^.*[^/]$
RewriteCond %{REQUEST_URI} !^.*//.*$
RewriteCond %{REQUEST_METHOD} !POST
RewriteCond %{QUERY_STRING} ^$
RewriteCond %{HTTP:Cookie} !^.*(comment_author_|wordpress_logged_in|wp-postpass_).*$
RewriteCond %{HTTP:X-Wap-Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTP:Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTP:Accept-Encoding} gzip
RewriteCond %{HTTPS} on
RewriteCond PATH-REMOVED-FOR-PRIVACY/web/content/wp-content/cache/supercache/%{SERVER_NAME}/$1/index-https.html.gz -f
RewriteRule ^(.*) “/wp-content/cache/supercache/%{SERVER_NAME}/$1/index-https.html.gz” [L]
RewriteCond %{REQUEST_URI} !^.*[^/]$
RewriteCond %{REQUEST_URI} !^.*//.*$
RewriteCond %{REQUEST_METHOD} !POST
RewriteCond %{QUERY_STRING} ^$
RewriteCond %{HTTP:Cookie} !^.*(comment_author_|wordpress_logged_in|wp-postpass_).*$
RewriteCond %{HTTP:X-Wap-Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTP:Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTP:Accept-Encoding} gzip
RewriteCond %{HTTPS} !on
RewriteCond PATH-REMOVED-FOR-PRIVACY/web/content/wp-content/cache/supercache/%{SERVER_NAME}/$1/index.html.gz -f
RewriteRule ^(.*) “/wp-content/cache/supercache/%{SERVER_NAME}/$1/index.html.gz” [L]
RewriteCond %{REQUEST_URI} !^.*[^/]$
RewriteCond %{REQUEST_URI} !^.*//.*$
RewriteCond %{REQUEST_METHOD} !POST
RewriteCond %{QUERY_STRING} ^$
RewriteCond %{HTTP:Cookie} !^.*(comment_author_|wordpress_logged_in|wp-postpass_).*$
RewriteCond %{HTTP:X-Wap-Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTP:Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTPS} on
RewriteCond PATH-REMOVED-FOR-PRIVACY/web/content/wp-content/cache/supercache/%{SERVER_NAME}/$1/index-https.html -f
RewriteRule ^(.*) “/wp-content/cache/supercache/%{SERVER_NAME}/$1/index-https.html” [L]
RewriteCond %{REQUEST_URI} !^.*[^/]$
RewriteCond %{REQUEST_URI} !^.*//.*$
RewriteCond %{REQUEST_METHOD} !POST
RewriteCond %{QUERY_STRING} ^$
RewriteCond %{HTTP:Cookie} !^.*(comment_author_|wordpress_logged_in|wp-postpass_).*$
RewriteCond %{HTTP:X-Wap-Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTP:Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTPS} !on
RewriteCond PATH-REMOVED-FOR-PRIVACY/web/content/wp-content/cache/supercache/%{SERVER_NAME}/$1/index.html -f
RewriteRule ^(.*) “/wp-content/cache/supercache/%{SERVER_NAME}/$1/index.html” [L]
</IfModule>
# END WPSuperCache