def main(request, response):
"""
Simple handler that sets a response header based on if device-memory
request header was received or not.
"""
if "device-memory" in request.headers:
response.headers.set("device-memory-received", "true")
if "dpr" in request.headers:
response.headers.set("dpr-received", "true")
if "viewport-width" in request.headers:
response.headers.set("viewport-width-received", "true")