@type t() :: %Kreuzcrawl.ResponseMeta{
  cache_control: String.t() | nil,
  content_encoding: String.t() | nil,
  content_language: String.t() | nil,
  etag: String.t() | nil,
  last_modified: String.t() | nil,
  server: String.t() | nil,
  x_powered_by: String.t() | nil
}