browser_bug1011748.js

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const gHttpTestRoot = "http://example.com/browser/dom/base/test/";

add_task(async function () {

  var statusTexts = [];

  var xhr = new XMLHttpRequest();

  var observer = {

    observe(aSubject, aTopic, aData) {

      try {

        var channel = aSubject.QueryInterface(Ci.nsIHttpChannel);

        channel.getResponseHeader("Location");

      } catch (e) {

        return;

      statusTexts.push(xhr.statusText);

},

};

  Services.obs.addObserver(observer, "http-on-examine-response");

  await new Promise(resolve => {

    xhr.addEventListener("load", function () {

      statusTexts.push(this.statusText);

      is(statusTexts[0], "", "Empty statusText value for HTTP 302");

      is(statusTexts[1], "OK", "OK statusText value for the redirect.");

      resolve();

});

    xhr.open("GET", gHttpTestRoot + "file_bug1011748_redirect.sjs", true);

    xhr.send();

});

  Services.obs.removeObserver(observer, "http-on-examine-response");

});