See espterm.github.io
espterm-demo-website/write_defaults.html

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7 years ago
<!DOCTYPE HTML>
<script>
var ref = document.referrer;
var qat = document.referrer.indexOf('?');
if (qat !== -1) ref = ref.substring(0, qat)
location.href=ref+'?msg=Request ignored, this is a demo.';
</script>