title: ERR CONNECTION RESET in xmlhttprequest for file download
body: <p>Hi I am running this code to download some ( 4 -5 ) zip files with response set as blob. These calls, approx 5 calls  fire at a time as below code runs in loop. But in a production server whis is aws, it returns CONNECTION RESET in console log after 2 files download. Can anyone highlight what may cause this error. I guess too many request at a time is refused by the server, but not sure. Any help is highly appritiated. Thanks</p>
  
  <pre><code>self.ajax_call_1 = function (url, type, callback) {
      return new Promise(function (resolve, reject) {
          var xhr = new XMLHttpRequest();
          xhr.responseType = 'blob';
          xhr.onreadystatechange = function () {
      if (this.readyState == 4 &amp;&amp; this.status ==     200) {
                      resolve(xhr.response);
              }
          }
          xhr.open(type, url, true);
          xhr.send();
      });
  }
  </code></pre>