Ticket #48283: 48283.diff

src/wp-cron.php

@@ -20 +20 @@
 
 /* Don't make the request block till we finish, if possible. */
 if ( function_exists( 'fastcgi_finish_request' ) && version_compare( phpversion(), '7.0.16', '>=' ) ) {
-        header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );
-        header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
+        if ( ! headers_sent() ) {
+                header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );
+                header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
+        }
+
         fastcgi_finish_request();
 }