Title: Not adding html debug comment or x-cache engine header
Last modified: August 21, 2016

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# Not adding html debug comment or x-cache engine header

 *  Resolved [rhodie](https://wordpress.org/support/users/rhodie/)
 * (@rhodie)
 * [12 years, 1 month ago](https://wordpress.org/support/topic/not-adding-html-debug-comment-or-x-cache-engine-header/)
 * Just trying to verify that wp-ffpc is working as expected. Site tests faster (
   usually) but I don’t see the debugging comment or the the header, even though
   both are checked in the settings.
 * [https://wordpress.org/plugins/wp-ffpc/](https://wordpress.org/plugins/wp-ffpc/)

Viewing 5 replies - 1 through 5 (of 5 total)

 *  Plugin Author [petermolnar](https://wordpress.org/support/users/cadeyrn/)
 * (@cadeyrn)
 * [12 years, 1 month ago](https://wordpress.org/support/topic/not-adding-html-debug-comment-or-x-cache-engine-header/#post-4779099)
 * Hi,
 * Please turn on debugging to see what’s wrong; this does not give me enough information
   to solve it.
 *  Thread Starter [rhodie](https://wordpress.org/support/users/rhodie/)
 * (@rhodie)
 * [12 years, 1 month ago](https://wordpress.org/support/topic/not-adding-html-debug-comment-or-x-cache-engine-header/#post-4779110)
 * OK, done. I don’t see any errors in debug.log:
 * >  PHP Notice: wp-ffpc init starting in /path/to/wp-content/plugins/wp-ffpc/wp-
   > common/wp-plugin-utilities.php on line 59, referer: [http://domain.tld/](http://domain.tld/)
   > 
   > PHP Notice: wp-ffpc 127.0.0.1:11211 added, persistent mode: 0 in /path/to/wp-
   > content/plugins/wp-ffpc/wp-common/wp-plugin-utilities.php on line 59, referer:
   > [http://domain.tld/](http://domain.tld/) PHP Notice: wp-ffpc checking server
   > statuses in /path/to/wp-content/plugins/wp-ffpc/wp-common/wp-plugin-utilities.
   > php on line 59, referer: [http://domain.tld/](http://domain.tld/) PHP Notice:
   > wp-ffpc 127.0.0.1:11211 server is up & running in /path/to/wp-content/plugins/
   > wp-ffpc/wp-common/wp-plugin-utilities.php on line 59, referer: [http://domain.tld/](http://domain.tld/)
   > PHP Notice: wp-ffpc CRON clearing event in /path/to/wp-content/plugins/wp-ffpc/
   > wp-common/wp-plugin-utilities.php on line 59, referer: [http://domain.tld/](http://domain.tld/)
 *  Thread Starter [rhodie](https://wordpress.org/support/users/rhodie/)
 * (@rhodie)
 * [12 years, 1 month ago](https://wordpress.org/support/topic/not-adding-html-debug-comment-or-x-cache-engine-header/#post-4779114)
 * Only error so far: `PHP Warning: call_user_func_array() expects parameter 1 to
   be a valid callback, function 'wp_ffpc_redirect_callback' not found or invalid
   function name in /path/to/wp-includes/plugin.php on line 199`
 *  Plugin Author [petermolnar](https://wordpress.org/support/users/cadeyrn/)
 * (@cadeyrn)
 * [11 years, 7 months ago](https://wordpress.org/support/topic/not-adding-html-debug-comment-or-x-cache-engine-header/#post-4779384)
 * hi rhodie,
 * was this issue solved? The new versions should have most of these issues.
 *  Plugin Author [petermolnar](https://wordpress.org/support/users/cadeyrn/)
 * (@cadeyrn)
 * [11 years, 5 months ago](https://wordpress.org/support/topic/not-adding-html-debug-comment-or-x-cache-engine-header/#post-4779389)
 * No response from user.

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘Not adding html debug comment or x-cache engine header’ is closed to 
new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/wp-ffpc_ffffff.svg)
 * [WP-FFPC](https://wordpress.org/plugins/wp-ffpc/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-ffpc/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-ffpc/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-ffpc/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-ffpc/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-ffpc/reviews/)

 * 5 replies
 * 2 participants
 * Last reply from: [petermolnar](https://wordpress.org/support/users/cadeyrn/)
 * Last activity: [11 years, 5 months ago](https://wordpress.org/support/topic/not-adding-html-debug-comment-or-x-cache-engine-header/#post-4779389)
 * Status: resolved