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   1 # static mixed http\Env::getRequestHeader([string $header_name])
   2
   3 Retrieve one or all headers of the current HTTP request.
   4
   5 ## Parameters:
   6
   7 * Optional ```string $header_name```
   8   The key of a header to retrieve.
   9
  10 ## Returns:
  11
  12 * ```NULL```, if $header_name was not found
  13 * ```string```, the compound header when $header_name was found
  14 * ```array``` of all headers if $header_name was not specified