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Script Loader: Add Etag: $wp_version header in load-scripts.php and load-styles.php.

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This improves performance since browsers won't re-download the scripts and styles when there was no change in `$wp_version`.

Props sergej.mueller, dd32, swissspidy.
Fixes #28722.
Built from https://develop.svn.wordpress.org/trunk@36312


git-svn-id: http://core.svn.wordpress.org/trunk@36279 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Pascal Birchler
2016-01-15 10:23:25 +00:00
parent 283684b616
commit 9ea68bc533
3 changed files with 21 additions and 1 deletions
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10
wp-admin/load-styles.php
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@@ -30,6 +30,15 @@ $out = '';
$wp_styles = new WP_Styles();
wp_default_styles($wp_styles);
if ( isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) && stripslashes( $_SERVER['HTTP_IF_NONE_MATCH'] ) === $wp_version ) {
$protocol = $_SERVER['SERVER_PROTOCOL'];
if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0' ) ) ) {
$protocol = 'HTTP/1.0';
}
header( "$protocol 304 Not Modified" );
exit();
}
foreach ( $load as $handle ) {
if ( !array_key_exists($handle, $wp_styles->registered) )
continue;
@@ -54,6 +63,7 @@ foreach ( $load as $handle ) {
}
}
header("Etag: $wp_version");
header('Content-Type: text/css; charset=UTF-8');
header('Expires: ' . gmdate( "D, d M Y H:i:s", time() + $expires_offset ) . ' GMT');
header("Cache-Control: public, max-age=$expires_offset");