gecko-dev/dom/xhr/tests/xhr2_worker.js

/**
 * Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/
 */
/* eslint-env worker */
onmessage = function(event) {
  const url = event.data;

  var xhr = new XMLHttpRequest();
  xhr.open("GET", url, false);
  xhr.send();

  const refText = xhr.responseText;

  function getResponse(type) {
    xhr = new XMLHttpRequest();
    xhr.open("GET", url, false);
    if (type !== undefined) {
      xhr.responseType = type;
    }
    xhr.send();
    return xhr.response;
  }

  if (getResponse() != refText) {
    throw new Error("unset responseType failed");
  }

  if (getResponse("") != refText) {
    throw new Error("'' responseType failed");
  }

  if (getResponse("text") != refText) {
    throw new Error("'text' responseType failed");
  }

  var array = new Uint8Array(getResponse("arraybuffer"));
  if (String.fromCharCode.apply(String, array) != refText) {
    throw new Error("'arraybuffer' responseType failed");
  }

  var blob = getResponse("blob");
  if (new FileReaderSync().readAsText(blob) != refText) {
    throw new Error("'blob' responseType failed");
  }

  // Make sure that we get invalid state exceptions when getting the wrong
  // property.

  function testResponseTextException(type) {
    xhr = new XMLHttpRequest();
    xhr.open("GET", url, false);
    xhr.responseType = type;
    xhr.send();

    var exception;

    try {
      xhr.responseText;
    } catch (e) {
      exception = e;
    }

    if (!exception) {
      throw new Error(
        "Failed to throw when getting responseText on '" + type + "' type"
      );
    }

    if (exception.name != "InvalidStateError") {
      throw new Error(
        "Unexpected error when getting responseText on '" + type + "' type"
      );
    }

    if (exception.code != DOMException.INVALID_STATE_ERR) {
      throw new Error(
        "Unexpected error code when getting responseText on '" + type + "' type"
      );
    }
  }

  testResponseTextException("arraybuffer");
  testResponseTextException("blob");

  // Make sure "document" works, but returns text.
  xhr = new XMLHttpRequest();

  if (xhr.responseType != "") {
    throw new Error("Default value for responseType is wrong!");
  }

  xhr.open("GET", url, false);
  xhr.responseType = "document";
  xhr.send();

  if (xhr.responseText != refText) {
    throw new Error("'document' type not working correctly");
  }

  postMessage("done");
};