Allow redirects for requests that require preflight.

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/redirect.php

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/redirect.php
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/redirect.php b/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/redirect.php
index af37c0d6857da4677f4b377949d63b3ecfa2c73a..7a24a5fe60e2b571fcd08bae43820c0e340eea92 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/redirect.php
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/redirect.php
@@ -1,12 +1,14 @@
 <?php
-if (isset($_GET['Status'])) {
-  header ("HTTP/1.1 " . $_GET["Status"]);
-} else {
-  header ("HTTP/1.1 302");
-}
-$url = $_GET['Redirect'];
-if ($url != "noLocation") {
-  header("Location: $url");
+if ($_SERVER['REQUEST_METHOD'] !== 'OPTIONS') {
+  $url = $_GET['Redirect'];
+  if ($url != "noLocation") {
+    header("Location: $url");
+  }
+  if (isset($_GET['Status'])) {
+    header("HTTP/1.1 " . $_GET["Status"]);
+  } else {
+    header("HTTP/1.1 302");
+  }
 }
 if (isset($_GET['ACAOrigin'])) {
   $origins = explode(',', $_GET['ACAOrigin']);