[Test] [Fetch][XHR] Patch for testing Location header in Preflight Response

LayoutTests/http/tests/serviceworker/resources/fetch-access-control.php

 <?php
 header('X-ServiceWorker-ServerHeader: SetInTheServer');
 
 $prefix = '';
 // If PreflightTest is set:
 // - Use PACAOrign, PACAHeaders, PACAMethods, PACACredentials, PACEHeaders,
 //   PAuth, and PAuthFail parameters in preflight.
 // - Use $_GET['PreflightTest'] as HTTP status code.
 // - Check Access-Control-Request-Method/Headers headers with
 //   PACRMethod/Headers parameter, if set, in preflight.
 if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS' && isset($_GET['PreflightTest'])) {
     $prefix = 'P';
 
     if (isset($_GET['PACRMethod']) &&
         $_GET['PACRMethod'] !=
         $_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']) {
         header("HTTP/1.1 400");
         exit;
     }
     if (isset($_GET['PACRHeaders']) &&
         $_GET['PACRHeaders'] !=
         $_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']) {
         header("HTTP/1.1 400");
         exit;
     }
     header("HTTP/1.1 {$_GET['PreflightTest']}");
 }
 
+if (isset($_GET[$prefix . 'Redirect'])) {
+  header('Location: ' . $_GET[$prefix . 'Redirect']);
+}
+
 if (isset($_GET[$prefix . 'ACAOrigin'])) {
     $origins = explode(',', $_GET[$prefix . 'ACAOrigin']);
     for ($i = 0; $i < sizeof($origins); ++$i)
         header("Access-Control-Allow-Origin: " . $origins[$i], false);
 }
 if (isset($_GET[$prefix . 'ACAHeaders']))
     header('Access-Control-Allow-Headers: ' . $_GET[$prefix . 'ACAHeaders']);
 if (isset($_GET[$prefix . 'ACAMethods']))
     header('Access-Control-Allow-Methods: ' . $_GET[$prefix . 'ACAMethods']);
 if (isset($_GET[$prefix . 'ACACredentials']))
@@ skipping 55 matching lines @@
              'body' => file_get_contents('php://input'),
              'files' => $files,
              'get' => $_GET,
              'post' => $_POST,
              'username' => $username,
              'password' => $password,
              'cookie' => $cookie);
 $json = json_encode($arr);
 echo "report( $json );";
 ?>