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chromium/android_webview/test/shell/assets/cors.html 

<!doctype html>
<html>
<head><title>running</title></head>
<body><script>
window.onload = function () {
  const params = new URL(document.location).searchParams;
  const api = params.get('api');
  if (api == "xhr") {
    const xhr = new XMLHttpRequest();
    xhr.open('get', params.get('url'), true);
    xhr.onload = e => document.title = 'load';
    xhr.onerror = e => document.title = 'error';
    xhr.onabort = e => document.title = 'abort';
    xhr.send();
  } else if (api == "fetch") {
    fetch(params.get('url')).then(
      e => document.title = 'load',
      e => document.title = 'error');
  } else {
    document.title = "unknown api";
  }
};
</script></body>
</html>