Merge pull request #1984 from NativeScript/feature/xhr-ng2-text

Attach toString() method to xhr response

xhr/xhr.ts

@@ -105,8 +105,8 @@ export class XMLHttpRequest {
         this._setResponseType();
 
         if (this.responseType === XMLHttpRequestResponseType.json) {
-            this._responseTextReader = () => r.content.toString();
+            this._prepareJsonResponse(r);
-            this._response = JSON.parse(this.responseText);
+
         } else if (this.responseType === XMLHttpRequestResponseType.empty ||
             this.responseType === XMLHttpRequestResponseType.text) {
             this._responseTextReader = () => r.content.toString();
@@ -115,6 +115,20 @@ export class XMLHttpRequest {
         this._setReadyState(this.DONE);
     }
 
+    private _prepareJsonResponse(r) {
+        this._responseTextReader = () => r.content.toString();
+        this._response = JSON.parse(this.responseText);
+
+        // Add toString() method to ease debugging and 
+        // make Angular2 response.text() method work properly.
+        Object.defineProperty(this._response, "toString", {
+            configurable: true,
+            enumerable: false,
+            writable: true,
+            value: () => this.responseText
+        });
+    }
+
     private _setResponseType() {
         const header = this.getResponseHeader('Content-Type');
         const contentType = header && header.toLowerCase();