Import //fetch from Web Platform Tests.

third_party/WebKit/LayoutTests/external/wpt/fetch/api/redirect/redirect-method.js

+if (this.document === undefined) {
+  importScripts("/resources/testharness.js");
+  importScripts("../resources/utils.js");
+}
+
+function redirectMethod(desc, redirectUrl, redirectLocation, redirectStatus, method, expectedMethod) {
+  var url = redirectUrl;
+  var urlParameters = "?redirect_status=" + redirectStatus;
+  urlParameters += "&location=" + encodeURIComponent(redirectLocation);
+
+  var requestInit = {"method": method, "redirect": "follow"};
+  if (method != "GET" && method != "HEAD")
+    requestInit.body = "this is my body";
+
+  promise_test(function(test) {
+    return fetch(url + urlParameters, requestInit).then(function(resp) {
+      assert_equals(resp.status, 200, "Response's status is 200");
+      assert_equals(resp.type, "basic", "Response's type basic");
+      assert_equals(resp.headers.get("x-request-method"), expectedMethod, "Request method after redirection is " + expectedMethod);
+      assert_true(resp.redirected);
+      return resp.text().then(function(text) {
+        assert_equals(text, expectedMethod == "POST" ? requestInit.body : "");
+      });
+    });
+  }, desc);
+}
+
+promise_test(function(test) {
+  assert_false(new Response().redirected);
+  return fetch(RESOURCES_DIR + "method.py").then(function(resp) {
+    assert_equals(resp.status, 200, "Response's status is 200");
+    assert_false(resp.redirected);
+  });
+}, "Response.redirected should be false on not-redirected responses");
+
+var redirUrl = RESOURCES_DIR + "redirect.py";
+var locationUrl = "method.py";
+
+redirectMethod("Redirect 301 with GET", redirUrl, locationUrl, 301, "GET", "GET");
+redirectMethod("Redirect 301 with POST", redirUrl, locationUrl, 301, "POST", "GET");
+redirectMethod("Redirect 301 with HEAD", redirUrl, locationUrl, 301, "HEAD", "HEAD");
+
+redirectMethod("Redirect 302 with GET", redirUrl, locationUrl, 302, "GET", "GET");
+redirectMethod("Redirect 302 with POST", redirUrl, locationUrl, 302, "POST", "GET");
+redirectMethod("Redirect 302 with HEAD", redirUrl, locationUrl, 302, "HEAD", "HEAD");
+
+redirectMethod("Redirect 303 with GET", redirUrl, locationUrl, 303, "GET", "GET");
+redirectMethod("Redirect 303 with POST", redirUrl, locationUrl, 303, "POST", "GET");
+redirectMethod("Redirect 303 with HEAD", redirUrl, locationUrl, 303, "HEAD", "HEAD");
+
+redirectMethod("Redirect 307 with GET", redirUrl, locationUrl, 307, "GET", "GET");
+redirectMethod("Redirect 307 with POST", redirUrl, locationUrl, 307, "POST", "POST");
+redirectMethod("Redirect 307 with HEAD", redirUrl, locationUrl, 307, "HEAD", "HEAD");
+
+done();