@spec free_domains() :: [String.t(), ...]

@spec status_codes() :: %{
  info: [non_neg_integer()],
  success: [non_neg_integer()],
  redirection: [non_neg_integer()],
  client_error: [non_neg_integer()],
  server_error: [non_neg_integer()]
}

@spec suffixes() :: [String.t(), ...]