Loader.useXDomainRequest boolean automatically set to true if the browser is specifically detected as IE9, but you can still override this. IE10 will use xhr.

Author: photonstorm

README.md

@@ -76,7 +76,7 @@ Version 2.1.0 - "Cairhien" - -in development-
 * Arcade Physics Body.skipQuadTree is a new boolean that if set to `true` when you collide the Sprite against a Group it will tell Phaser to skip using a QuadTree for that collision. This is handy if this Body is especially large.
 * Arcade Physics World.skipQuadTree will disable the use of all QuadTrees in collision methods, which can help performance in tightly packed scenes.
 * Cordova 'deviceready' event check added (thanks @videlais #1120)
-* Loader.useXDomainRequest boolean added. If `true` (the default is `false`) it will use XDomainRequest when loading JSON files instead of xhr. In rare IE edge-cases this may be required. You'll know if you need it (#1131 #1116)
+* Loader.useXDomainRequest boolean added. If `true` (the default is `false`, unless the browser is detected as being IE9 specifically) it will use XDomainRequest when loading JSON files instead of xhr. In rare IE edge-cases this may be required. You'll know if you need it (#1131 #1116)
 * Added support for Tiled objects type field (thanks @rex64 #1111)
 * Tile properties are now copied from the Tiled JSON data to the Phaser.Tile objects when parsed (thanks @beeglebug #1126)
 * All Images now have a frameData value, even if it's only one frame. This removes lots of engine code needed to check if images are sprite sheets or not, and simplifies game code too (thanks @lucbloom #1059)

build/custom/phaser-arcade-physics.js

@@ -7,7 +7,7 @@
 *
 * Phaser - http://phaser.io
 *
-* v2.1.0 "Cairhien" - Built: Thu Aug 28 2014 04:50:34
+* v2.1.0 "Cairhien" - Built: Thu Aug 28 2014 05:23:08
 *
 * By Richard Davey http://www.photonstorm.com @photonstorm
 *
@@ -11176,7 +11176,7 @@ PIXI.RenderTexture.tempMatrix = new PIXI.Matrix();
 *
 * Phaser - http://phaser.io
 *
-* v2.1.0 "Cairhien" - Built: Thu Aug 28 2014 04:50:34
+* v2.1.0 "Cairhien" - Built: Thu Aug 28 2014 05:23:08
 *
 * By Richard Davey http://www.photonstorm.com @photonstorm
 *
@@ -47609,10 +47609,9 @@ Phaser.Loader = function (game) {
     this.onPackComplete = new Phaser.Signal();
 
     /**
-    * @property {boolean} useXDomainRequest - If true and if the browser supports XDomainRequest, it will be used in preference for xhr. You'll know if you need this or not.
-    * @default
+    * @property {boolean} useXDomainRequest - If true and if the browser supports XDomainRequest, it will be used in preference for xhr when loading json files. It is enabled automatically if the browser is IE9, but you can disable it as required.
     */
-    this.useXDomainRequest = false;
+    this.useXDomainRequest = (this.game.device.ieVersion === 9);
 
     /**
     * @property {array} _packList - Contains all the assets packs.
@@ -48737,7 +48736,7 @@ Phaser.Loader.prototype = {
                 {
                     this._ajax = new window.XDomainRequest();
 
-                    // XDomainRequest has a few querks. Occasionally it will abort requests
+                    // XDomainRequest has a few quirks. Occasionally it will abort requests
                     // A way to avoid this is to make sure ALL callbacks are set even if not used
                     // More info here: http://stackoverflow.com/questions/15786966/xdomainrequest-aborts-post-on-ie-9
                     this._ajax.timeout = 3000;
@@ -48758,7 +48757,11 @@ Phaser.Loader.prototype = {
 
                     this._ajax.open('GET', this.baseURL + file.url, true);
 
-                    this._ajax.send();
+                    //  Note: The xdr.send() call is wrapped in a timeout to prevent an issue with the interface where some requests are lost 
+                    //  if multiple XDomainRequests are being sent at the same time.
+                    setTimeout(function () {
+                        this._ajax.send();
+                    }, 0);
                 }
                 else
                 {

build/custom/phaser-arcade-physics.min.js

@@ -7,7 +7,7 @@
 *
 * Phaser - http://phaser.io
 *
-* v2.1.0 "Cairhien" - Built: Thu Aug 28 2014 04:50:34
+* v2.1.0 "Cairhien" - Built: Thu Aug 28 2014 05:23:08
 *
 * By Richard Davey http://www.photonstorm.com @photonstorm
 *
@@ -36440,10 +36440,9 @@ Phaser.Loader = function (game) {
     this.onPackComplete = new Phaser.Signal();
 
     /**
-    * @property {boolean} useXDomainRequest - If true and if the browser supports XDomainRequest, it will be used in preference for xhr. You'll know if you need this or not.
-    * @default
+    * @property {boolean} useXDomainRequest - If true and if the browser supports XDomainRequest, it will be used in preference for xhr when loading json files. It is enabled automatically if the browser is IE9, but you can disable it as required.
     */
-    this.useXDomainRequest = false;
+    this.useXDomainRequest = (this.game.device.ieVersion === 9);
 
     /**
     * @property {array} _packList - Contains all the assets packs.
@@ -37568,7 +37567,7 @@ Phaser.Loader.prototype = {
                 {
                     this._ajax = new window.XDomainRequest();
 
-                    // XDomainRequest has a few querks. Occasionally it will abort requests
+                    // XDomainRequest has a few quirks. Occasionally it will abort requests
                     // A way to avoid this is to make sure ALL callbacks are set even if not used
                     // More info here: http://stackoverflow.com/questions/15786966/xdomainrequest-aborts-post-on-ie-9
                     this._ajax.timeout = 3000;
@@ -37589,7 +37588,11 @@ Phaser.Loader.prototype = {
 
                     this._ajax.open('GET', this.baseURL + file.url, true);
 
-                    this._ajax.send();
+                    //  Note: The xdr.send() call is wrapped in a timeout to prevent an issue with the interface where some requests are lost 
+                    //  if multiple XDomainRequests are being sent at the same time.
+                    setTimeout(function () {
+                        this._ajax.send();
+                    }, 0);
                 }
                 else
                 {

build/custom/phaser-no-libs.js

@@ -7,7 +7,7 @@
 *
 * Phaser - http://phaser.io
 *
-* v2.1.0 "Cairhien" - Built: Thu Aug 28 2014 04:50:34
+* v2.1.0 "Cairhien" - Built: Thu Aug 28 2014 05:23:08
 *
 * By Richard Davey http://www.photonstorm.com @photonstorm
 *
@@ -11176,7 +11176,7 @@ PIXI.RenderTexture.tempMatrix = new PIXI.Matrix();
 *
 * Phaser - http://phaser.io
 *
-* v2.1.0 "Cairhien" - Built: Thu Aug 28 2014 04:50:34
+* v2.1.0 "Cairhien" - Built: Thu Aug 28 2014 05:23:08
 *
 * By Richard Davey http://www.photonstorm.com @photonstorm
 *
@@ -47609,10 +47609,9 @@ Phaser.Loader = function (game) {
     this.onPackComplete = new Phaser.Signal();
 
     /**
-    * @property {boolean} useXDomainRequest - If true and if the browser supports XDomainRequest, it will be used in preference for xhr. You'll know if you need this or not.
-    * @default
+    * @property {boolean} useXDomainRequest - If true and if the browser supports XDomainRequest, it will be used in preference for xhr when loading json files. It is enabled automatically if the browser is IE9, but you can disable it as required.
     */
-    this.useXDomainRequest = false;
+    this.useXDomainRequest = (this.game.device.ieVersion === 9);
 
     /**
     * @property {array} _packList - Contains all the assets packs.
@@ -48737,7 +48736,7 @@ Phaser.Loader.prototype = {
                 {
                     this._ajax = new window.XDomainRequest();
 
-                    // XDomainRequest has a few querks. Occasionally it will abort requests
+                    // XDomainRequest has a few quirks. Occasionally it will abort requests
                     // A way to avoid this is to make sure ALL callbacks are set even if not used
                     // More info here: http://stackoverflow.com/questions/15786966/xdomainrequest-aborts-post-on-ie-9
                     this._ajax.timeout = 3000;
@@ -48758,7 +48757,11 @@ Phaser.Loader.prototype = {
 
                     this._ajax.open('GET', this.baseURL + file.url, true);
 
-                    this._ajax.send();
+                    //  Note: The xdr.send() call is wrapped in a timeout to prevent an issue with the interface where some requests are lost 
+                    //  if multiple XDomainRequests are being sent at the same time.
+                    setTimeout(function () {
+                        this._ajax.send();
+                    }, 0);
                 }
                 else
                 {

build/custom/phaser-no-libs.min.js

@@ -100,10 +100,9 @@ Phaser.Loader = function (game) {
     this.onPackComplete = new Phaser.Signal();
 
     /**
-    * @property {boolean} useXDomainRequest - If true and if the browser supports XDomainRequest, it will be used in preference for xhr. You'll know if you need this or not.
-    * @default
+    * @property {boolean} useXDomainRequest - If true and if the browser supports XDomainRequest, it will be used in preference for xhr when loading json files. It is enabled automatically if the browser is IE9, but you can disable it as required.
     */
-    this.useXDomainRequest = false;
+    this.useXDomainRequest = (this.game.device.ieVersion === 9);
 
     /**
     * @property {array} _packList - Contains all the assets packs.
@@ -1228,7 +1227,7 @@ Phaser.Loader.prototype = {
                 {
                     this._ajax = new window.XDomainRequest();
 
-                    // XDomainRequest has a few querks. Occasionally it will abort requests
+                    // XDomainRequest has a few quirks. Occasionally it will abort requests
                     // A way to avoid this is to make sure ALL callbacks are set even if not used
                     // More info here: http://stackoverflow.com/questions/15786966/xdomainrequest-aborts-post-on-ie-9
                     this._ajax.timeout = 3000;
@@ -1249,7 +1248,11 @@ Phaser.Loader.prototype = {
 
                     this._ajax.open('GET', this.baseURL + file.url, true);
 
-                    this._ajax.send();
+                    //  Note: The xdr.send() call is wrapped in a timeout to prevent an issue with the interface where some requests are lost 
+                    //  if multiple XDomainRequests are being sent at the same time.
+                    setTimeout(function () {
+                        this._ajax.send();
+                    }, 0);
                 }
                 else
                 {