Ticket #42313: 42313.3.diff

wp-includes/pluggable.php

@@ -1213 +1213 @@
         if ( !$is_IIS && PHP_SAPI != 'cgi-fcgi' )
                 status_header($status); // This causes problems on IIS and some FastCGI setups
 
+        /**
+         * Filters the x-redirect-by header, allows applications to identify themselves when they're doing a redirect.
+         *
+         * @since 5.0
+         *
+         * @param string $x_redirect_by The application doing the redirect.
+         * @param int    $status        Status code to use.
+         * @param string $location      The path to redirect to.
+         */
+        $x_redirect_by = apply_filters( 'x_redirect_by', 'WordPress', $status, $location );
+        if ( is_string( $x_redirect_by ) ) {
+                header( sprintf( "X-Redirect-By: %s", $x_redirect_by  ) );
+        }
+
         header("Location: $location", true, $status);
 
         return true;