From 70bd1a1639c111523bf02dc5d161566c60e7e9d3 Mon Sep 17 00:00:00 2001
From: Derek Kastner <dkastner@gmail.com>
Date: Thu, 22 Mar 2012 14:25:50 -0400
Subject: [PATCH] IE XDomainRequest support for IE CORS

---
 index.js       |  9 ++++++---
 lib/request.js | 17 +++++++++++++++++
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/index.js b/index.js
index bca5a27..5d24b5e 100644
--- a/index.js
+++ b/index.js
@@ -7,7 +7,7 @@ http.request = function (params, cb) {
     if (!params.host) params.host = window.location.host.split(':')[0];
     if (!params.port) params.port = window.location.port;
     
-    var req = new Request(new xhrHttp, params);
+    var req = new Request(new xhrHttp(params), params);
     if (cb) req.on('response', cb);
     return req;
 };
@@ -22,10 +22,13 @@ http.get = function (params, cb) {
 http.Agent = function () {};
 http.Agent.defaultMaxSockets = 4;
 
-var xhrHttp = (function () {
+var xhrHttp = function (params) {
     if (typeof window === 'undefined') {
         throw new Error('no window object present');
     }
+    else if (params.host != window.location.host.split(':')[0] && window.XDomainRequest) {
+        return window.XDomainRequest;
+    }
     else if (window.XMLHttpRequest) {
         return window.XMLHttpRequest;
     }
@@ -56,4 +59,4 @@ var xhrHttp = (function () {
     else {
         throw new Error('ajax not supported in this browser');
     }
-})();
+};
diff --git a/lib/request.js b/lib/request.js
index 19ecca3..f5ad1b7 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -32,9 +32,26 @@ var Request = module.exports = function (xhr, params) {
         self.emit('response', res);
     });
     
+
+    xhr.onprogress = function() {  // IE XDR
+        xhr.readyState = 2;
+        res.getAllResponseHeaders = function() {
+          return 'Content-Type: ' + xhr.contentType;  // This is the only header available
+        };
+        res.handle(xhr);
+    }
     xhr.onreadystatechange = function () {
         res.handle(xhr);
     };
+    xhr.onload = function() {  // IE XDR
+        xhr.readyState = 4;
+        res.handle(xhr);
+    };
+    xhr.onerror = function() {  // IE XDR
+        xhr.readyState = 3;
+        xhr.error = 'Unknown error';
+        res.handle(xhr);
+    };
 };
 
 Request.prototype = new EventEmitter;