class Faraday::Response::RaiseError

def on_complete(env)
  case env[:status]
  when 404
    raise Faraday::ResourceNotFound, response_values(env)
  when 407
    # mimic the behavior that we get with proxy requests with HTTPS
    raise Faraday::ConnectionFailed.new(
            %{407 "Proxy Authentication Required "},
            response_values(env))
  when ClientErrorStatuses
    raise Faraday::ClientError, response_values(env)
  when nil
    raise Faraday::NilStatusError, response_values(env)
  end
end

def response_values(env)
  {:status => env.status, :headers => env.response_headers, :body => env.body}
end