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chromium/third_party/blink/web_tests/external/wpt/beacon/headers/header-origin-same-origin.html 

<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <title>SendBeacon Origin Header Same Origin Policy</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <meta name='referrer' content='same-origin'>
  </head>
  <body>
    <script src="/common/utils.js"></script>
    <script src="/common/get-host-info.sub.js"></script>
    <script src="header-referrer.js"></script>
    <script>
      var testBase = RESOURCES_DIR;
      const addBody = true;
      testOriginHeader(testBase, window.location.origin);
      testOriginHeader(testBase, window.location.origin, addBody);

      testBase = get_host_info().HTTP_REMOTE_ORIGIN + RESOURCES_DIR;
      testOriginHeader(testBase, "null");
      testOriginHeader(testBase, "null", addBody);
    </script>
  </body>
</html>