unregister-controller-page.html (445B)
1 <!DOCTYPE html> 2 <script> 3 function fetch_url(url) { 4 return new Promise(function(resolve, reject) { 5 var request = new XMLHttpRequest(); 6 request.addEventListener('load', function(event) { 7 if (request.status == 200) 8 resolve(request.response); 9 else 10 reject(Error(request.statusText)); 11 }); 12 request.open('GET', url); 13 request.send(); 14 }); 15 } 16 </script>