diff --git a/src/polyfills.ts b/src/polyfills.ts
index d68672ff..da130aca 100644
--- a/src/polyfills.ts
+++ b/src/polyfills.ts
@@ -19,20 +19,20 @@
  */
 
 /** IE9, IE10 and IE11 requires all of the following polyfills. **/
-// import 'core-js/es6/symbol';
-// import 'core-js/es6/object';
-// import 'core-js/es6/function';
-// import 'core-js/es6/parse-int';
-// import 'core-js/es6/parse-float';
-// import 'core-js/es6/number';
-// import 'core-js/es6/math';
-// import 'core-js/es6/string';
-// import 'core-js/es6/date';
-// import 'core-js/es6/array';
-// import 'core-js/es6/regexp';
-// import 'core-js/es6/map';
-// import 'core-js/es6/weak-map';
-// import 'core-js/es6/set';
+import 'core-js/es6/symbol';
+import 'core-js/es6/object';
+import 'core-js/es6/function';
+import 'core-js/es6/parse-int';
+import 'core-js/es6/parse-float';
+import 'core-js/es6/number';
+import 'core-js/es6/math';
+import 'core-js/es6/string';
+import 'core-js/es6/date';
+import 'core-js/es6/array';
+import 'core-js/es6/regexp';
+import 'core-js/es6/map';
+import 'core-js/es6/weak-map';
+import 'core-js/es6/set';
 
 /** IE10 and IE11 requires the following for NgClass support on SVG elements */
 // import 'classlist.js';  // Run `npm install --save classlist.js`.
@@ -40,27 +40,21 @@
 /** IE10 and IE11 requires the following for the Reflect API. */
 // import 'core-js/es6/reflect';
 
-
 /** Evergreen browsers require these. **/
 // Used for reflect-metadata in JIT. If you use AOT (and only Angular decorators), you can remove.
 import 'core-js/es7/reflect';
 
-
 /**
  * Required to support Web Animations `@angular/platform-browser/animations`.
  * Needed for: All but Chrome, Firefox and Opera. http://caniuse.com/#feat=web-animation
  **/
 // import 'web-animations-js';  // Run `npm install --save web-animations-js`.
 
-
-
 /***************************************************************************************************
  * Zone JS is required by default for Angular itself.
  */
 import 'zone.js/dist/zone';  // Included with Angular CLI.
 
-
-
 /***************************************************************************************************
  * APPLICATION IMPORTS
  */
diff --git a/src/uploadx/src/uploader.ts b/src/uploadx/src/uploader.ts
index 37e27b41..e14577fb 100644
--- a/src/uploadx/src/uploader.ts
+++ b/src/uploadx/src/uploader.ts
@@ -119,8 +119,8 @@ export class Uploader implements UploaderOptions {
       return this.resume();
     }
     const xhr = new XMLHttpRequest();
-    xhr.responseType = 'json';
     xhr.open(this.method, this.options.url, true);
+    xhr.responseType = 'json';
     if (!!this.options.withCredentials) {
       xhr.withCredentials = true;
     }
@@ -149,10 +149,10 @@ export class Uploader implements UploaderOptions {
    */
   private resume(): void {
     const xhr: XMLHttpRequest = XHRFactory.getInstance();
+    xhr.open('PUT', this.url, true);
     if (xhr.responseType !== 'json') {
       xhr.responseType = 'json';
     }
-    xhr.open('PUT', this.url, true);
     if (!!this.options.withCredentials) {
       xhr.withCredentials = true;
     }
@@ -210,11 +210,10 @@ export class Uploader implements UploaderOptions {
     end = end > this.size ? this.size : end;
     const chunk: Blob = this.file.slice(start, end);
     const xhr: XMLHttpRequest = XHRFactory.getInstance();
+    xhr.open('PUT', this.url, true);
     if (xhr.responseType !== 'json') {
       xhr.responseType = 'json';
     }
-
-    xhr.open('PUT', this.url, true);
     if (!!this.options.withCredentials) {
       xhr.withCredentials = true;
     }