class Grape::Middleware::Versioner::Header

def fail!
  return if env[Grape::Env::GRAPE_ALLOWED_METHODS].present?
  media_types = q_values_mime_types.map { |mime_type| Grape::Util::MediaType.parse(mime_type) }
  vendor_not_found!(media_types) || version_not_found!(media_types)
end