Title: [Plugin: Scripts Gzip] Caching & HTTP-Headers, Filters
Last modified: August 19, 2016

---

# [Plugin: Scripts Gzip] Caching & HTTP-Headers, Filters

 *  [Bernhard Riedl](https://wordpress.org/support/users/neoxx/)
 * (@neoxx)
 * [15 years, 4 months ago](https://wordpress.org/support/topic/plugin-scripts-gzip-caching-http-headers-filters/)
 * Hi Edward,
 * Thanks for developing _Scripts Gzip_. – I just gave it a test-run on one of my
   WP installations and the results look very promising.
 * After the integration I used [WebPagetest](http://www.webpagetest.org/) to verify
   the improvements. Your plugin did a good job on minifying the JavaScript files
   though on the re-run that WebPagetest conducts to check for browser caching, 
   I noticed that all requests were executed again.
 * Looking at the headers I figured that no data was transfered because you’ve defined
   a 304. Nevertheless the files won’t get cached (I might be wrong at that point)
   since the expiry is always in the past if the most recent change on every file
   in the ‘stack’ is longer ago than current time minus expiry.
 * So I’ve changed `$filetime` in `$expires = gmdate('D, d M Y H:i:s', $fileTime
   +$options['file_expires']) . ' GMT';` to `time()`.
 * Here’s a dump of my received headers (domain has been removed):
 * —
 * Request Headers:
 * GET /wp-content/plugins/scripts-gzip/gzip.php?css=wp-content%2Fthemes%2Fstyle%
   2Fstyle.css HTTP/1.1
    Accept: */* Referer: xxx Accept-Language: en-us UA-CPU:
   x86 Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 
   7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30;.
   NET CLR 3.0.04506.648; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; PTST 2.261)
   Host: xxx Connection: Keep-Alive
 * Response Headers:
 * HTTP/1.0 200 OK
    Date: Thu, 17 Feb 2011 00:14:25 GMT Server: Apache Pragma: public
   Expires: Mon, 14 Feb 2011 00:27:39 GMT Etag: “184ffe9db9b07bfea11622d405abaf37”
   Accept-Ranges: bytes Content-Encoding: gzip Last-Modified: Mon, 07 Feb 2011 00:
   27:39 GMT Connection: close Content-Type: text/css
 * —
 * I also added the following line for the cache control:
 * `header('Cache-Control: max-age='.$options['file_expires'].', public');`
 * What do you think?
 * Another idea: Could you maybe add [filters](http://codex.wordpress.org/Function_Reference/apply_filters)
   for the expiry time and the blacklist? – That way you gain flexibility and your
   users don’t have to edit the php-files on updates.
 * A last question: Since I don’t have more than one css-file on that particular
   website (and doing gzip in .htaccess anyway) I want to use your plugin solely
   for js-files. Is there an easy way to comment out a certain line to disable picking
   up and combining css-files while not breaking your plugin?
 * Cheers,
    Berny
 * [http://wordpress.org/extend/plugins/scripts-gzip/](http://wordpress.org/extend/plugins/scripts-gzip/)

The topic ‘[Plugin: Scripts Gzip] Caching & HTTP-Headers, Filters’ is closed to 
new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/scripts-gzip.svg)
 * [Scripts Gzip](https://wordpress.org/plugins/scripts-gzip/)
 * [Support Threads](https://wordpress.org/support/plugin/scripts-gzip/)
 * [Active Topics](https://wordpress.org/support/plugin/scripts-gzip/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/scripts-gzip/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/scripts-gzip/reviews/)

 * 0 replies
 * 1 participant
 * Last reply from: [Bernhard Riedl](https://wordpress.org/support/users/neoxx/)
 * Last activity: [15 years, 4 months ago](https://wordpress.org/support/topic/plugin-scripts-gzip-caching-http-headers-filters/)
 * Status: not resolved