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/* Any copyright is dedicated to the Public Domain.
function handleRequest(request, response) {
if (
request.queryString === "check_referrer" &&
(!request.hasHeader("referer") ||
request.getHeader("referer") !==
) {
response.setStatusLine(request.httpVersion, 400, "Bad Request");
response.write("Did not receive referrer");
} else {
response.setHeader("Content-Type", "text/html");
response.write(
`<span id="ok">OK</span>
<a id="check_referrer" href="?check_referrer">check_referrer</a>
<a id="fragment" href="#fragment">fragment</a>
<script>
function pushState(){
history.pushState({}, "", location);
}
</script>
<button id="push_state" onclick="pushState();" >push_state</button>`
);
}
}