text: // META: global=window,worker
  // META: script=../resources/utils.js
  
  function redirectLocation(desc, redirectUrl, redirectLocation, redirectStatus, redirectMode, shouldPass) {
    var url = redirectUrl;
    var urlParameters = "?redirect_status=" + redirectStatus;
    if (redirectLocation)
      urlParameters += "&location=" + encodeURIComponent(redirectLocation);
  
    var requestInit = {"redirect": redirectMode};
  
    promise_test(function(test) {
      if (redirectMode === "error" || !shouldPass)
        return promise_rejects_js(test, TypeError, fetch(url + urlParameters, requestInit));
      if (redirectMode === "manual")
        return fetch(url + urlParameters, requestInit).then(function(resp) {
          assert_equals(resp.status, 0, "Response's status is 0");
          assert_equals(resp.type, "opaqueredirect", "Response's type is opaqueredirect");
          assert_equals(resp.statusText, "", "Response's statusText is \"\"");
          assert_true(resp.headers.entries().next().done, "Headers should be empty");
        });
  
      if (redirectMode === "follow")
        return fetch(url + urlParameters, requestInit).then(function(resp) {
          assert_equals(resp.status, redirectStatus, "Response's status is " + redirectStatus);
        });
      assert_unreached(redirectMode + " is not a valid redirect mode");
    }, desc);
  }
  
  var redirUrl = RESOURCES_DIR + "redirect.py";
  var locationUrl = "top.txt";
  var invalidLocationUrl = "invalidurl:";
  var dataLocationUrl = "data:,data%20url";
  // FIXME: We may want to mix redirect-mode and cors-mode.
  // FIXME: Add tests for "error" redirect-mode.
  for (var statusCode of [301, 302, 303, 307, 308]) {
    redirectLocation("Redirect " + statusCode + " in \"follow\" mode without location", redirUrl, undefined, statusCode, "follow", true);
    redirectLocation("Redirect " + statusCode + " in \"manual\" mode without location", redirUrl, undefined, statusCode, "manual", true);
  
    redirectLocation("Redirect " + statusCode + " in \"follow\" mode with invalid location", redirUrl, invalidLocationUrl, statusCode, "follow", false);
    redirectLocation("Redirect " + statusCode + " in \"manual\" mode with invalid location", redirUrl, invalidLocationUrl, statusCode, "manual", true);
  
    redirectLocation("Redirect " + statusCode + " in \"follow\" mode with data location", redirUrl, dataLocationUrl, statusCode, "follow", false);
    redirectLocation("Redirect " + statusCode + " in \"manual\" mode with data location", redirUrl, dataLocationUrl, statusCode, "manual", true);
  }
  
  done();
  