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<title>[37944] trunk/src: General: Remove the `Pragma` header from responses.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/37944">37944</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/37944","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>pento</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2016-07-04 04:01:19 +0000 (Mon, 04 Jul 2016)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>General: Remove the `Pragma` header from responses.
`Pragma` is supposed to be a request header, but we've been including it in responses since the beginning of time.
This is a relic dating all the way back to b2, probably originally added because Internet Explorer version 5 and earlier didn't understand the `Cache-Control` header in responses, but they did (incorrectly) obey the `Pragma` header.
Internet Explorer 6 and 7 will obey the `Pragma` response header only if no other cache-related response headers are present (in our case, they are always present), and all other browsers ignore the `Pragma` response header.
Props geekysoft.
Fixes <a href="https://core.trac.wordpress.org/ticket/37250">#37250</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminincludesajaxactionsphp">trunk/src/wp-admin/includes/ajax-actions.php</a></li>
<li><a href="#trunksrcwpincludesfunctionsphp">trunk/src/wp-includes/functions.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpadminincludesajaxactionsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/ajax-actions.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/ajax-actions.php 2016-07-02 23:02:45 UTC (rev 37943)
+++ trunk/src/wp-admin/includes/ajax-actions.php 2016-07-04 04:01:19 UTC (rev 37944)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -174,7 +174,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );
</span><span class="cx" style="display: block; padding: 0 10px"> header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT' );
</span><span class="cx" style="display: block; padding: 0 10px"> header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- header( 'Pragma: no-cache' );
</del><span class="cx" style="display: block; padding: 0 10px"> header('Content-Type: application/javascript; charset=UTF-8');
</span><span class="cx" style="display: block; padding: 0 10px"> $force_gzip = ( defined('ENFORCE_GZIP') && ENFORCE_GZIP );
</span><span class="cx" style="display: block; padding: 0 10px"> $test_str = '"wpCompressionTest Lorem ipsum dolor sit amet consectetuer mollis sapien urna ut a. Eu nonummy condimentum fringilla tempor pretium platea vel nibh netus Maecenas. Hac molestie amet justo quis pellentesque est ultrices interdum nibh Morbi. Cras mattis pretium Phasellus ante ipsum ipsum ut sociis Suspendisse Lorem. Ante et non molestie. Porta urna Vestibulum egestas id congue nibh eu risus gravida sit. Ac augue auctor Ut et non a elit massa id sodales. Elit eu Nulla at nibh adipiscing mattis lacus mauris at tempus. Netus nibh quis suscipit nec feugiat eget sed lorem et urna. Pellentesque lacus at ut massa consectetuer ligula ut auctor semper Pellentesque. Ut metus massa nibh quam Curabitur molestie nec mauris congue. Volutpat molestie elit justo facilisis neque ac risus Ut nascetur tristique. Vitae sit lorem tellus et quis Phasellus lacus tincidunt nunc Fusce. Pharetra wisi Suspendisse mus sagittis li
bero lacinia Integer consequat ac Phasellus. Et urna ac cursus tortor aliquam Aliquam amet tellus volutpat Vestibulum. Justo interdum condimentum In augue congue tellus sollicitudin Quisque quis nibh."';
</span></span></pre></div>
<a id="trunksrcwpincludesfunctionsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/functions.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/functions.php 2016-07-02 23:02:45 UTC (rev 37943)
+++ trunk/src/wp-includes/functions.php 2016-07-04 04:01:19 UTC (rev 37944)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1099,7 +1099,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $headers = array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'Expires' => 'Wed, 11 Jan 1984 05:00:00 GMT',
</span><span class="cx" style="display: block; padding: 0 10px"> 'Cache-Control' => 'no-cache, must-revalidate, max-age=0',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'Pragma' => 'no-cache',
</del><span class="cx" style="display: block; padding: 0 10px"> );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> if ( function_exists('apply_filters') ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1115,7 +1114,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @type string $Expires Expires header.
</span><span class="cx" style="display: block; padding: 0 10px"> * @type string $Cache-Control Cache-Control header.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @type string $Pragma Pragma header.
</del><span class="cx" style="display: block; padding: 0 10px"> * }
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> $headers = (array) apply_filters( 'nocache_headers', $headers );
</span></span></pre>
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