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# This handler receives requests identified by UUIDs that have mandatory
# `location` query parameters. Every other request for the same URL will result
# in a redirect to the URL described by `location`. When we don't redirect, we
# simply return the HTML document "No redirect".
def main(request, response):
response.headers.set(b"Cache-Control", b"no-store")
uuid = request.GET.first(b"uuid")
value = request.server.stash.take(uuid)
if value is None:
response.status = 302
location = request.GET.first(b"location")
response.headers.set(b"Location", location)
# Ensure that the next time this uuid is request, we don't redirect.
request.server.stash.put(uuid, "sentinel value")
else:
# If we're in this branch, then `value` is not none, but the stash now
# has `None` associated with `uuid`, which means on the next request for
# this `uuid` we'll end up in the above branch instead.
return ([(b"Content-Type", b"text/html")], b"No redirect")