referrer-checker.py (379B)
1 def main(request, response): 2 referrer = request.headers.get(b"referer", b"") 3 response_headers = [(b"Content-Type", b"text/css"), 4 (b"Access-Control-Allow-Origin", b"*")] 5 # Put the referrer in a CSS rule that can be read by the importer through CSSOM 6 return (200, response_headers, 7 b'.referrer { content: "' + referrer + b'" }')