Changeset 22283

Timestamp:

10/23/2012 03:45:44 PM (12 years ago)

Author:

nacin

Message:

Do not issue a Last-Modified header when issuing no-cache headers to avoid aggressive (webkit) caching. Serve a blank header when header_remove() is not available (PHP < 5.3). props andy. fixes #22258.

Location:

trunk/wp-includes

Files:

• class-wp.php (modified) (1 diff)
• functions.php (modified) (2 diffs)

trunk/wp-includes/class-wp.php

@@ -382 +382 @@
             @header("{$name}: {$field_value}");
 
+        if ( isset( $headers['Last-Modified'] ) && empty( $headers['Last-Modified'] ) && function_exists( 'header_remove' ) )
+            header_remove( 'Last-Modified' );
+
         if ( $exit_required )
             exit();

trunk/wp-includes/functions.php

@@ -903 +903 @@
     $headers = array(
         'Expires' => 'Wed, 11 Jan 1984 05:00:00 GMT',
-        'Last-Modified' => gmdate( 'D, d M Y H:i:s' ) . ' GMT',
+        'Last-Modified' => '',
         'Cache-Control' => 'no-cache, must-revalidate, max-age=0',
         'Pragma' => 'no-cache',
@@ -927 +927 @@
     foreach( $headers as $name => $field_value )
         @header("{$name}: {$field_value}");
+    if ( empty( $headers['Last-Modified'] ) && function_exists( 'header_remove' ) )
+        header_remove( 'Last-Modified' );
 }