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   1 # static bool http\Env::setResponseHeader(string $header_name[, mixed $header_value = NULL[, int $response_code = 0[, bool $replace = true]]])
   2
   3 Set a response header, either replacing a prior set header, or appending the new header value, depending on $replace.
   4
   5 If no $header_value is specified, or $header_value is NULL, then a previously set header with the same key will be deleted from the list.
   6
   7 If $response_code is not 0, the response status code is updated accordingly.
   8
   9 ## Params:
  10
  11 * string $header_name, the name of the response header.
  12 * Optional mixed $header_value, the header value.
  13 * Optional int $response_code, any HTTP response status code to set.
  14 * Optional bool $replace, whether to replace a previously set response header with the same name.
  15
  16 ## Returns:
  17
  18 * bool Success.