Only use XDR when doing CORS

favor XHR in all other circumstances

diff --git a/js/pz2.js b/js/pz2.js
index a0afe3a..8ae1379 100644 (file)
--- a/js/pz2.js
+++ b/js/pz2.js
@@ -775,17 +775,19 @@ var pzHttpRequest = function (url, errorHandler, cookieDomain) {
         this.errorHandler = errorHandler || null;
         this.async = true;
         this.requestHeaders = {};
-        this.isXDomain = false;
+        this.isXDR = false;
         this.domainRegex = /https?:\/\/([^:/]+).*/;
         this.cookieDomain = cookieDomain || null;
 
         var xhr = new XMLHttpRequest();
+        var domain = this._getDomainFromUrl(url);
         if ("withCredentials" in xhr) {
           // XHR for Chrome/Firefox/Opera/Safari.
-        } else if (typeof XDomainRequest != "undefined") {
-          // XDomainRequest for IE.
+        } else if (domain && this._isCrossDomain(domain) &&
+            typeof XDomainRequest != "undefined") {
+          // use XDR (IE7/8) when no other way
           xhr = new XDomainRequest();
-          this.isXDomain = true;
+          this.isXDR = true;
         } else {
           // CORS not supported.
         }
@@ -914,12 +916,12 @@ pzHttpRequest.prototype =
           }
         }
         this.request.open( type, url, this.async );
-        if (!this.isXDomain) {
+        if (!this.isXDR) {
           //setting headers is only allowed with XHR
           for (var key in this.requestHeaders)
             this.request.setRequestHeader(key, this.requestHeaders[key]);
         }
-        if (this.isXDomain) {
+        if (this.isXDR) {
           this.request.onload = function () {
             //fake XHR props
             context.request.status = 200;
@@ -956,7 +958,7 @@ pzHttpRequest.prototype =
             // pick up appplication errors first
             var errNode = null;
             // xdomainreq does not have responseXML
-            if (this.isXDomain) {
+            if (this.isXDR) {
               if (this.request.contentType.match(/\/xml/)){                
                 var dom = new ActiveXObject('Microsoft.XMLDOM');
                 dom.async = false;