diff -r 000000000000 -r 6474c204b198 addon-sdk/source/lib/sdk/net/url.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/lib/sdk/net/url.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,88 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const { Cu, components } = require("chrome");
+const { defer } = require("../core/promise");
+const { merge } = require("../util/object");
+
+const { NetUtil } = Cu.import("resource://gre/modules/NetUtil.jsm", {});
+
+/**
+ * Reads a URI and returns a promise.
+ *
+ * @param uri {string} The URI to read
+ * @param [options] {object} This parameter can have any or all of the following
+ * fields: `charset`. By default the `charset` is set to 'UTF-8'.
+ *
+ * @returns {promise}  The promise that will be resolved with the content of the
+ *          URL given.
+ *
+ * @example
+ *  let promise = readURI('resource://gre/modules/NetUtil.jsm', {
+ *    charset: 'US-ASCII'
+ *  });
+ */
+function readURI(uri, options) {
+  options = options || {};
+  let charset = options.charset || 'UTF-8';
+
+  let channel = NetUtil.newChannel(uri, charset, null);
+
+  let { promise, resolve, reject } = defer();
+
+  try {
+    NetUtil.asyncFetch(channel, function (stream, result) {
+      if (components.isSuccessCode(result)) {
+        let count = stream.available();
+        let data = NetUtil.readInputStreamToString(stream, count, { charset : charset });
+
+        resolve(data);
+      } else {
+        reject("Failed to read: '" + uri + "' (Error Code: " + result + ")");
+      }
+    });
+  }
+  catch (e) {
+    reject("Failed to read: '" + uri + "' (Error: " + e.message + ")");
+  }
+
+  return promise;
+}
+
+exports.readURI = readURI;
+
+/**
+ * Reads a URI synchronously.
+ * This function is intentionally undocumented to favorites the `readURI` usage.
+ *
+ * @param uri {string} The URI to read
+ * @param [charset] {string} The character set to use when read the content of
+ *        the `uri` given.  By default is set to 'UTF-8'.
+ *
+ * @returns {string} The content of the URI given.
+ *
+ * @example
+ *  let data = readURISync('resource://gre/modules/NetUtil.jsm');
+ */
+function readURISync(uri, charset) {
+  charset = typeof charset === "string" ? charset : "UTF-8";
+
+  let channel = NetUtil.newChannel(uri, charset, null);
+  let stream = channel.open();
+
+  let count = stream.available();
+  let data = NetUtil.readInputStreamToString(stream, count, { charset : charset });
+
+  stream.close();
+
+  return data;
+}
+
+exports.readURISync = readURISync;