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def main(request, response):
if b"allow_origin" in request.GET:
response.headers.set(b"Access-Control-Allow-Origin",
request.GET.first(b"allow_origin"))
if b"timing_allow_origin" in request.GET:
response.headers.set(b"Timing-Allow-Origin",
request.GET.first(b"timing_allow_origin"))
# Handle CORS-preflights of non-simple requests.
if request.method == 'OPTIONS':
response.status = 204
requested_method = request.headers.get(b"Access-Control-Request-Method")
if requested_method:
response.headers.set(b"Access-Control-Allow-Methods", requested_method)
requested_headers = request.headers.get(b"Access-Control-Request-Headers")
if requested_headers:
response.headers.set(b"Access-Control-Allow-Headers", requested_headers)
else:
location = request.GET.first(b"location")
response.status = 302
response.headers.set(b"Location", location)