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   1 # int http\Env\Response::isCachedByEtag([string $header_name = "If-None-Match"])
   2
   3 Manually test the header $header_name of the environment's request for a cache hit.
   4 http\Env\Response::send() checks that itself, though.
   5
   6 ## Params:
   7
   8 * Optional string $header_name = "If-None-Match"
   9   The request header to test.
  10
  11 ## Returns:
  12
  13 * int, a http\Env\Response::CACHE_* constant.