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   1 # http\Env\Response http\Env\Response::setEtag(string $etag)
   2
   3 Set a custom ETag.
   4
   5 > **Note:** This will be used for caching and pre-condition checks.
   6
   7 ## Params:
   8
   9 * string $etag
  10   A ETag.
  11
  12 ## Returns:
  13
  14 * http\Env\Response, self.
  15
  16 ## Throws:
  17
  18 * http\Exception\InvalidArgumentException