Title: Php Errors + Static File Headers + Mobile View Not functioning Last modified: January 16, 2025 --- # Php Errors + Static File Headers + Mobile View Not functioning * Resolved [Jenny](https://wordpress.org/support/users/enigma666666/) * (@enigma666666) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/) * I noticed today that the Browser static file caching headers is disabled, even though it was previously enabled. **The error on the page is:** “The .htaccess file already contains browser static caching settings, but browser caching is not functioning as expected. This indicates that your webserver does not support. htaccess browser caching rules. To further investigate this, you must contact your web hosting provider.” I then clicked the enabled button again and seems to work but after a mins it shows the same error and it is disabled again. * **So I had a look at the server logs and saw** **Multiple server errors in server log throughout the day:** * invalid URI path (/wp-content/cache/wpo-minify/1737024527/assets/%url%) * [ERROR] : WP_CACHE constant is not present in wp-config.php * [ERROR] : Could not turn off the WP_CACHE constant in wp-config.php * PHP Warning: file_put_contents(/home/website name/public_html/wp-config.php): Failed to open stream: Permission denied in /home/website name/public_html/wp- content/plugins/wp-optimize/cache/class-wpo-page-cache.php on line 938 thrown in /home/website name/public_html/wp-includes/widgets/class-wp-widget-block.php on line 17 * **Steps implemented to try and resolve the above issues:** * Did a plugin conflict test. It did not help. * Cleared cache and minified cache. Exported the settings and then wiped wp-optimze settings. This did not help so I re-imported the settings. * Checked wp-config and .htaccess file. Regenerated .htaccess file, to see if that resolves the issue, it did not. * Changed file permissions to see if that resolves the issue, but not helping. * Worst of all, when I had a look at the website on my mobile, I saw that the mobile view of the website has stopped displaying content and mobile menu and search stopped working as well. Content can only be viewed in mobile view if you navigate to another page and then go back to the homepage. This must have been going on since the last plugin update, because when I now rolled back WP-Optimize plugin to the previous version, mobile view is functioning properly again. However the Browser static file caching headers are still disabled with the same error mentioned in this post, even though I did enable it after I rolled back the plugin. Viewing 11 replies - 1 through 11 (of 11 total) * Plugin Support [vupdraft](https://wordpress.org/support/users/vupdraft/) * (@vupdraft) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18248130) * Can you add the following to your wp-config *  **define( ‘WP_CACHE’, true );**  * Could I have your site URL so I can view it on my mobile? * Thread Starter [Jenny](https://wordpress.org/support/users/enigma666666/) * (@enigma666666) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18248145) *  **define( ‘WP_CACHE’, true );**  is already inside wp-config * I always had Asynchronously load selected for JavaScript files selected but even with previous version of the plugin, the mobile view is now not loading properly. If I load js with defer it think it works. * Thank you, here is the website link, running on previous version of wp-optimize with Asynchronously load selected for JavaScript files: [https://seedsandplants.co.za](https://seedsandplants.co.za) - This reply was modified 1 year, 4 months ago by [Jenny](https://wordpress.org/support/users/enigma666666/). * Thread Starter [Jenny](https://wordpress.org/support/users/enigma666666/) * (@enigma666666) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18248231) * I changed the js loading now to defer by enabling option: Use the “defer” html attribute , then cleared the homepage page cache and now the mobile view seems to be functioning properly again. But the Browser static file caching is still disabled – only stays enabled for a few minutes before disabling and showing error message I mentioned earlier. I’m now going to updated to latest version of plugin to see if mobile view will still function with js deferred. * Ok feedback: I rolled forward/ updated the plugin, and mobile view with js deferred did not function properly, did not load content as I described earlier. So I now rolled back the plugin again, keeping js as deferred, but mobile view is now not functioning properly again. What I notice now is that if I go to desktop view and clear the page cache for the homepage and I then go on mobile (after clearing mobile browser cache), and I visit website on mobile again, it functions properly again. So only if I manually clear desktop version of the website’s cache, will the mobile view of the website function properly. If I close mobile browser and go to website on mobile again without clearing desktop cache, then mobile once again does not function properly. * My Conclusion: Deferring js instead of loading js Asynchronously does not make a difference, because the issue seems to be related to cache, as mobile only functions when page cache is manually cleared on desktop and once mobile cache is cleared on mobile device mobile view once again no longer functions? - This reply was modified 1 year, 4 months ago by [Jenny](https://wordpress.org/support/users/enigma666666/). - This reply was modified 1 year, 4 months ago by [Jenny](https://wordpress.org/support/users/enigma666666/). - This reply was modified 1 year, 4 months ago by [Jenny](https://wordpress.org/support/users/enigma666666/). * Thread Starter [Jenny](https://wordpress.org/support/users/enigma666666/) * (@enigma666666) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18248316) * I’ve now disabled Wp-optimize plugin for now until I can find a solution to this issue, as I cannot continue to have mobile view not functioning. Without wp-optimize the mobile view functions properly. - This reply was modified 1 year, 4 months ago by [Jenny](https://wordpress.org/support/users/enigma666666/). * Plugin Support [vupdraft](https://wordpress.org/support/users/vupdraft/) * (@vupdraft) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18250007) * Can you deactivate the Docker cache plugin, I think it might be conflicting ( at the moment WPO is not doing your caching, the Docker plugin is) * Thread Starter [Jenny](https://wordpress.org/support/users/enigma666666/) * (@enigma666666) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18251464) * The Docket cache plugin is only used for object cache using OPcache which is installed on my server. Docket does not cache pages. I already did a conflict test by disabling docket plugin and also by disabling cache in Wp-optimize when Docket plugin is active. Both methods made no difference with regards to the Expires headers problem in WP-Optimize. Running both wp-optimize and docket object cache together does not cause an issue and the 2 plugins seems to work well together. * As for mobile display issues, I’ve managed to resolve it by completely deleting WP-Optimize plugin and then reinstalling. Reinstalling for some reason fixed the issues with the mobile display, so that is now sorted out and everything is working as it should. * The only issue that still remains is the Expires heading setting that keeps on disabling, giving me the error I mentioned before. I dont know why this is happening, as the code is in my htaccess file: * BEGIN WP-Optimize Browser Cache * ExpiresActive On ExpiresByType text/css “access 28 days” ExpiresByType text/html“ access 28 days” ExpiresByType image/gif “access 28 days” ExpiresByType image/ png “access 28 days” ExpiresByType image/jpg “access 28 days” ExpiresByType image/ jpeg “access 28 days” ExpiresByType image/webp “access 28 days” ExpiresByType image/x-icon “access 28 days” ExpiresByType application/pdf “access 28 days” ExpiresByType application/javascript “access 28 days” ExpiresByType text/x-javascript“ access 28 days” ExpiresByType application/x-shockwave-flash “access 28 days” ExpiresDefault “access 28 days” * Header set Cache-Control “public” Header set Cache-Control “public” Header set Cache-Control “private” Header set Cache-Control “private, must-revalidate” Disable ETag * FileETag None END WP-Optimize Browser Cache - This reply was modified 1 year, 4 months ago by [Jenny](https://wordpress.org/support/users/enigma666666/). * Plugin Support [vupdraft](https://wordpress.org/support/users/vupdraft/) * (@vupdraft) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18254733) * Apologies which expires heading is this? * Thread Starter [Jenny](https://wordpress.org/support/users/enigma666666/) * (@enigma666666) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18257920) * Apologies for the late reply. I am referring to what I mentioned in the first post on this thread : * “the Browser static file caching headers is disabled, even though it was previously enabled. **The error on the page is:** “The .htaccess file already contains browser static caching settings, but browser caching is not functioning as expected. This indicates that your webserver does not support .htaccess browser caching rules. To further investigate this, you must contact your web hosting provider.” I then clicked the enabled button again and seems to work but after a mins it shows the same error and it is disabled again.” * My htaccess file contains the required code for static headers, but the enable static file cache headers button inside wp-optimize settings, disables after enabling the button and gives the above error. * My htaccess code: * BEGIN WP-Optimize Gzip compression Compress HTML, CSS, JavaScript, Text, XML and fonts * ```wp-block-code AddType application/vnd.ms-fontobject .eot AddType font/ttf .ttf AddType font/otf .otf AddType font/x-woff .woff AddType image/svg+xml .svg AddOutputFilterByType DEFLATE application/javascript AddOutputFilterByType DEFLATE application/rss+xml AddOutputFilterByType DEFLATE application/vnd.ms-fontobject AddOutputFilterByType DEFLATE application/x-font AddOutputFilterByType DEFLATE application/x-font-opentype AddOutputFilterByType DEFLATE application/x-font-otf AddOutputFilterByType DEFLATE application/x-font-truetype AddOutputFilterByType DEFLATE application/x-font-ttf AddOutputFilterByType DEFLATE application/x-font-woff AddOutputFilterByType DEFLATE application/x-javascript AddOutputFilterByType DEFLATE application/xhtml+xml AddOutputFilterByType DEFLATE application/xml AddOutputFilterByType DEFLATE font/opentype AddOutputFilterByType DEFLATE font/otf AddOutputFilterByType DEFLATE font/ttf AddOutputFilterByType DEFLATE font/woff AddOutputFilterByType DEFLATE image/svg+xml AddOutputFilterByType DEFLATE image/x-icon AddOutputFilterByType DEFLATE text/css AddOutputFilterByType DEFLATE text/html AddOutputFilterByType DEFLATE text/javascript AddOutputFilterByType DEFLATE text/plain AddOutputFilterByType DEFLATE text/xml ``` * Remove browser bugs (only needed for really old browsers) * ```wp-block-code BrowserMatch ^Mozilla/4 gzip-only-text/html BrowserMatch ^Mozilla/4\.0[678] no-gzip BrowserMatch \bMSIE !no-gzip !gzip-only-text/html Header append Vary User-Agent ``` * END WP-Optimize Gzip compression BEGIN WP-Optimize Browser Cache * ExpiresActive On ExpiresByType text/css “access 28 days” ExpiresByType text/html“ access 28 days” ExpiresByType image/gif “access 28 days” ExpiresByType image/ png “access 28 days” ExpiresByType image/jpg “access 28 days” ExpiresByType image/ jpeg “access 28 days” ExpiresByType image/webp “access 28 days” ExpiresByType image/avif “access 28 days” ExpiresByType image/x-icon “access 28 days” ExpiresByType application/pdf “access 28 days” ExpiresByType application/javascript “access 28 days” ExpiresByType text/x-javascript “access 28 days” ExpiresByType application/ x-shockwave-flash “access 28 days” ExpiresDefault “access 28 days” * Header set Cache-Control “public” Header set Cache-Control “public” Header set Cache-Control “private” Header set Cache-Control “private, must-revalidate” Disable ETag * FileETag None END WP-Optimize Browser Cache * Thread Starter [Jenny](https://wordpress.org/support/users/enigma666666/) * (@enigma666666) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18258066) * If I look at an image using dev/web tools under network tab, I see this response: * **Response Header (301B)** * HTTP/1.1 200 OK Date: Wed, 22 Jan 2025 07:11:12 GMTServer: ApacheCache-Control: private Vary: Accept,User-AgentLast-Modified: Sat, 18 Jan 2025 10:54:51 GMTAccept- Ranges: bytesContent-Length: 21981Cache-Control: publicKeep-Alive: timeout=5, max=95Connection: Keep-AliveContent-Type: image/avif * **—->I don’t see Cache-Control: max-age** * **—->I don’t see Expires: date and time** * **—->I don’t see Etag: date and time** * **HOWEVER, I do not get a “leverage browser caching warning” in PageSpeed Insights, so I guess the fact that the button in wp-optimize to enable Browser static file caching headers** **is not working, does not matter, since code is already inside htaccess file? ** * **I only get a “Serve static assets with an efficient cache policy** **warning” in PageSpeed Insights, which shows the problem to be min.css files, which includes also wp-optimize’s header and footer min-css files.** **What can I do so that these min.css files do not appear under “serve static assets” warning?** * Plugin Support [vupdraft](https://wordpress.org/support/users/vupdraft/) * (@vupdraft) * [1 year, 4 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18259645) * Who is your hosting with, have you contacted them? * It seems that your server does not support the rules added to your .htaccess * Some hosting providers no longer support the use of the .htaccess so it’s worth checking this. * Also, WPO supports Cloudflare so putting your site behind Clouflare should work around this and provide better security for you site. The free plan would do this for you. * Thread Starter [Jenny](https://wordpress.org/support/users/enigma666666/) * (@enigma666666) * [1 year, 3 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18260431) * Thank you, but the server is apache and does support the use of htaccess and I also double checked this on the server, so I do not need to contact my hosting provider or use Cloudfare. * I have now fixed the issue by editing htaccess file code. * Thank you for all your patience and assistance, this issue is now resolved. - This reply was modified 1 year, 3 months ago by [Jenny](https://wordpress.org/support/users/enigma666666/). - This reply was modified 1 year, 3 months ago by [Jenny](https://wordpress.org/support/users/enigma666666/). Viewing 11 replies - 1 through 11 (of 11 total) The topic ‘Php Errors + Static File Headers + Mobile View Not functioning’ is closed to new replies. * ![](https://ps.w.org/wp-optimize/assets/icon-256x256.png?rev=1552899) * [WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance](https://wordpress.org/plugins/wp-optimize/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-optimize/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-optimize/) * [Active Topics](https://wordpress.org/support/plugin/wp-optimize/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-optimize/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-optimize/reviews/) * 11 replies * 2 participants * Last reply from: [Jenny](https://wordpress.org/support/users/enigma666666/) * Last activity: [1 year, 3 months ago](https://wordpress.org/support/topic/php-errors-static-file-headers-mobile-view-not-functioning/#post-18260431) * Status: resolved