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def main(request, response):
response.headers.set(b"Access-Control-Allow-Origin", b"*")
response.headers.set(b"Access-Control-Max-Age", b"0")
response.headers.set(b"Timing-Allow-Origin", b"*")
# If this script is accessed with the header X-Require-Preflight then the
# browser will send a preflight request. Otherwise it won't.
if request.method == u'OPTIONS':
response.headers.set(b"Access-Control-Allow-Headers",
b"X-Require-Preflight")