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1. Tats Shibata
   Member
   Posted 6 months ago #

   Some people report a problem about "The pages do not match! Timestamps differ or were not found!" with Cache Tester. I also had it but found one of the root causes, which seems to be a bug.

   The cache for the front page are always re-generated when certain WordPress settings are used. Therefore, the timestamps always differ.

   * VERSION

   WordPress 3.2.1
   WP Super Cache 0.9.9.9

   * SETTINGS

   Settings > General > WordPress address (URL): http://rewse.jp/blog
   Settings > Permalinks > Custom Structure: /p/%post_id%

   WP Super Cache > Advanced > Caching: Use PHP to serve cache files.

   * ANALYSIS

   wp-cache.php:

   if ( substr( get_option( 'permalink_structure' ), -1 ) == '/' ) {
     wp_cache_replace_line('^ *\$wp_cache_slash_check', "\$wp_cache_slash_check = 1;", $wp_cache_config_file);
   } else {
     wp_cache_replace_line('^ *\$wp_cache_slash_check', "\$wp_cache_slash_check = 0;", $wp_cache_config_file);
   }

   $wp_cache_slash_check is set to 0 when get_option('permalink_structure') is "/p/%post_id%".

   wp-cache-phase1.php:

   if (
     (
       $wp_cache_request_uri == '/' ||
       ( $wp_cache_slash_check && substr( $wp_cache_request_uri, -1 ) == '/' ) ||
       ( $wp_cache_slash_check == 0 && substr( $wp_cache_request_uri, -1 ) != '/' )
     ) &&
     ( wp_cache_get_cookies_values() == '' && empty( $_GET ) && $serving_supercache ) )

   $wp_cache_request_uri is "/blog/" when http://rewse.jp/blog/ is accessed. By the above, $wp_cache_slash_check is 0. These 2 values mean this if statement is always false -- always goes to "No wp-cache file exists. Must generate a new one." -- when http://rewse.jp/blog/ is accessed.

   * WORKAROUND

   I confirmed to fix it by the below dirty huck.

   if (
     (
       $wp_cache_request_uri == '/blog/' ||

   * DEBUG LOGS

   Before workaround:

   01:04:11 /blog/ supercache dir: /var/lib/wordpress/rsrc/cache/supercache/rewse.jp/blog/
   01:04:11 /blog/ No wp-cache file exists. Must generate a new one.
   01:04:12 /blog/ In WP Cache Phase 2
   01:04:12 /blog/ Setting up WordPress actions
   01:04:12 /blog/ Created output buffer
   01:04:13 /blog/ Output buffer callback
   01:04:13 /blog/ Anonymous user detected. Only creating Supercache file.
   01:04:13 /blog/ Gzipping buffer.
   01:04:13 /blog/ Writing non-gzipped buffer to supercache file.
   01:04:13 /blog/ Writing gzipped buffer to supercache file.
   01:04:13 /blog/ Renamed temp supercache file to /var/lib/wordpress/rsrc/cache/supercache/rewse.jp/blog/index.html
   01:04:13 /blog/ Renamed temp supercache gz file to /var/lib/wordpress/rsrc/cache/supercache/rewse.jp/blog/index.html.gz
   01:04:13 /blog/ Writing gzip content headers. Sending buffer to browser
   01:04:13 /blog/ wp_cache_shutdown_callback: collecting meta data.
   01:04:39 /blog/ supercache dir: /var/lib/wordpress/rsrc/cache/supercache/rewse.jp/blog/
   01:04:39 /blog/ No wp-cache file exists. Must generate a new one.
   01:04:39 /blog/ In WP Cache Phase 2
   01:04:39 /blog/ Setting up WordPress actions
   01:04:39 /blog/ Created output buffer
   01:04:40 /blog/ Output buffer callback
   01:04:40 /blog/ Anonymous user detected. Only creating Supercache file.
   01:04:40 /blog/ Gzipping buffer.
   01:04:40 /blog/ Writing non-gzipped buffer to supercache file.
   01:04:40 /blog/ Writing gzipped buffer to supercache file.
   01:04:40 /blog/ Renamed temp supercache file to /var/lib/wordpress/rsrc/cache/supercache/rewse.jp/blog/index.html
   01:04:40 /blog/ Renamed temp supercache gz file to /var/lib/wordpress/rsrc/cache/supercache/rewse.jp/blog/index.html.gz
   01:04:40 /blog/ Writing gzip content headers. Sending buffer to browser
   01:04:40 /blog/ wp_cache_shutdown_callback: collecting meta data.

   After workaround:

   01:08:34 /blog/ supercache dir: /var/lib/wordpress/rsrc/cache/supercache/rewse.jp/blog/
   01:08:34 /blog/ Served page from supercache file using PHP.
   01:08:48 /blog/ supercache dir: /var/lib/wordpress/rsrc/cache/supercache/rewse.jp/blog/
   01:08:48 /blog/ Served page from supercache file using PHP.

   Thanks,
   Tats

   http://wordpress.org/extend/plugins/wp-super-cache/

2. Donncha O Caoimh
   Member
   Posted 6 months ago #

   So, the problem is that your site isn't at /, but rather at /blog/. I think I need to cache that somewhere as WordPress hasn't loaded yet when this code runs. Thanks for reporting that!

3. Donncha O Caoimh
   Member
   Posted 6 months ago #

   Try the development version. It's on the "Other versions" page and using it I couldn't replicate this problem on a test site.

   Hmm, even tried this using 0.9.9.9 and it worked fine. I'm not sure why it's not working for you.

4. Tats Shibata
   Member
   Posted 6 months ago #

   The development version doesn't fix that. Some other settings might be different between you and me.

   I put the below 2 lines just in front of the if statment (line 167 on wp-cache-phase1.php of the dev version).

   wp_cache_debug("wp_cache_slash_check: $wp_cache_slash_check", 5);
   wp_cache_debug("wp_cache_request_uri: $wp_cache_request_uri", 5);

   The below was my result. May I have your these 2 values?

   15:41:21 /blog/ wp_cache_slash_check: 0
   15:41:21 /blog/ wp_cache_request_uri: /blog/

5. Donncha O Caoimh
   Member
   Posted 6 months ago #

   Thanks for that. After checking those I realised I hadn't set my permalinks correctly. I think this should be easy enough to fix.

6. Donncha O Caoimh
   Member
   Posted 6 months ago #

   I've just checked a change into the plugin that should fix this. It'll be in the development version in a few minutes. Make sure you visit the settings page when you upgrade as that caches your home url.

7. Tats Shibata
   Member
   Posted 6 months ago #

   I've just confirmed to fix that by the latest development version. Thanks a lot.

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