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def main(request, response):
response.headers.set(b"Cache-Control", b"no-store")
# Allow simple requests, but deny preflight
if request.method != u"OPTIONS":
if b"origin" in request.headers:
response.headers.set(b"Access-Control-Allow-Credentials", b"true")
response.headers.set(b"Access-Control-Allow-Origin", request.headers[b"origin"])
else:
response.status = 500
else:
response.status = 400