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def main(request, response):
"""
Returns an HTML response that notifies its parent frame the topics header
via postMessage
"""
topics_header = request.headers.get(b"sec-browsing-topics", b"NO_TOPICS_HEADER")
headers = [(b"Content-Type", b"text/html"),
(b"Access-Control-Allow-Origin", b"*")]
content = b'''
<script>
let parentOrOpener = window.opener || window.parent;
parentOrOpener.postMessage({ topicsHeader: '%s'}, "*");
</script>
''' % (topics_header)
return 200, headers, content