set_header_request.html | Explore in Territory

<html>
  <head></head>
  <body>
    <script>
      // Start a request with the Test header set.
      var req = new XMLHttpRequest();
      req.onload = function() {
        document.title = 'loaded';
      };
      req.open('GET', './image.html');
      req.setRequestHeader('Test', 'SetByJS');
      req.send();
    </script>
  </body>
</html>

chromium/fuchsia_web/webengine/test/data/set_header_request.html