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   1 # static mixed http\Env::getResponseHeader([string $header_name])
   2
   3 Get one or all HTTP response headers to be sent.
   4
   5 ## Parameters:
   6
   7 * Optional ```string $header_name```
   8   The name of the response header to retrieve.
   9
  10 ## Returns:
  11
  12 * ```string```, the compound value of the response header to send
  13 * ```NULL```, if the header was not found
  14 * ```array```, of all response headers, if $header_name was not specified