referrer.py (353B)
1 def main(request, response): 2 response_headers = [(b"Access-Control-Allow-Origin", b"*")] 3 body = b""" 4 <p id=referrer>%s</p> 5 <script> 6 const referrer_text = referrer.textContent; 7 window.parent.postMessage(referrer_text, "*"); 8 </script> 9 """ % request.headers.get(b"referer", b"") 10 return (200, response_headers, body)