1<!DOCTYPE html> 2<html> 3 <head> 4 <meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests" /> 5 <meta http-equiv="cache-control" content="no-cache" /> 6 <meta http-equiv="Pragma" content="no-cache" /> 7 <title>Trace Example</title> 8 <style> 9 * { 10 box-sizing: border-box; 11 } 12 13 html, 14 body { 15 height: 100%; 16 margin: 0; 17 padding: 0; 18 overflow: hidden; 19 } 20 </style> 21 </head> 22 <body> 23 <script type="text/javascript"> 24 'use strict'; 25 sessionStorage.clear(); 26 let req = new XMLHttpRequest(); 27 req.open('GET', document.location, false); 28 req.send(null); 29 window.version = req.getResponseHeader('data-version') || ''; 30 </script> 31 </body> 32</html> 33