iframe.py (289B)
1 def main(request, response): 2 headers = [(b"Content-Type", b"text/html"), 3 (b"Cross-Origin-Resource-Policy", request.GET[b'corp'])] 4 return 200, headers, b"<body><h3>The iframe</h3><script>window.onmessage = () => { parent.postMessage('pong', '*'); }</script></body>"