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import sys
def main(request, response):
"""
Simple handler that sets a response header based on which client hint
request headers were received.
"""
response.headers.append(b"Content-Type", b"text/html; charset=UTF-8")
response.headers.append(b"Access-Control-Allow-Origin", b"*")
response.headers.append(b"Access-Control-Allow-Headers", b"*")
response.headers.append(b"Access-Control-Expose-Headers", b"*")
response.headers.append(b"Accept-CH", b"sec-ch-device-memory,device-memory")
critical = b"sec-ch-device-memory,device-memory"
if(request.GET.first(b"mismatch", None) is not None):
critical = b"sec-ch-viewport-width,viewport-width"
response.headers.append(b"Critical-CH", critical)
response.headers.append(b"Cache-Control", b"no-store")
result = "FAIL"
if b"sec-ch-device-memory" in request.headers and b"device-memory" in request.headers:
result = "PASS"
token = request.GET.first(b"token", None)
if(token is not None):
with request.server.stash.lock:
count = request.server.stash.take(token)
if(count == None):
count = 1
else:
count += 1
request.server.stash.put(token, count)
result = str(count)
if b"sec-ch-viewport-width" in request.headers and b"viewport-width" in request.headers:
result = "MISMATCH"
response.content = "<script>window.postMessage('{0}', '*')</script>".format(result)
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