downlod with progress

gistfile1.js

         function transferComplete() {
         
         }

         function stateChange() {
         contentSize = this.getResponseHeader('X-Content-size');//nginx se charge de la compression gzip et mange le content-size

         }

         function updateProgress(evt) {
         filtered_operations.trigger('loadProgress', evt.loaded, contentSize)
         }

         function failed(evt) { 

         }

         filtered_operations.trigger('loadStart')
         var xhr = new XMLHttpRequest();
         xhr.addEventListener('readystatechange', stateChange, false);
         xhr.addEventListener("progress", updateProgress, false);
         xhr.addEventListener("load", transferComplete, false);
         xhr.addEventListener("error", failed, false);
         xhr.addEventListener("abort", failed, false);
         xhr.open("get", url true);
         xhr.send();