File: echo-ua-client-hints-received.py

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import importlib
client_hints_ua_list = importlib.import_module("client-hints.resources.clienthintslist").client_hints_ua_list

def main(request, response):
    """
  Simple handler that sets a response header based on which client hint
  request headers were received.
  """

    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"*")

    client_hint_headers = client_hints_ua_list()
    request_client_hints = {i: request.headers.get(i) for i in client_hint_headers}

    for header in client_hint_headers:
        if request_client_hints[header] is not None:
            response.headers.set(header + b"-received", request_client_hints[header])

    headers = []
    content = u""
    return 200, headers, content