class Github::Response::RaiseError

def on_complete(env)
  status_code   = env[:status].to_i
  service_error = Github::Error::ServiceError
  error_class = service_error.error_mapping[status_code]
  if !error_class and (400...600) === status_code
    error_class = service_error
  end
  raise error_class.new(env) if error_class
end