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chromium/third_party/blink/web_tests/external/wpt/xhr/send-accept.htm 

<!doctype html>
<html>
  <head>
    <title>XMLHttpRequest: send() - Accept</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(text(),'*/*')]/.. following::code[contains(text(),'Accept')]/.. following::code[contains(text(),'Accept')]/../following::ul[1]/li[1]" />
  </head>
  <body>
    <div id="log"></div>
    <script>
      test(function() {
        var client = new XMLHttpRequest()
        client.open("GET", "resources/accept.py", false)
        client.send(null)
        assert_equals(client.responseText, "*/*")
        client.open("GET", "resources/accept.py", false)
        client.setRequestHeader("Accept", "x-something/vague, text/html5")
        client.send(null)
        assert_equals(client.responseText, "x-something/vague, text/html5")
      })
    </script>
  </body>
</html>