我们是否必须生成并使用客户端库来使用Google App Engine的端点？

I am currently developing an Swift iOS app with GAE Endpoints for the RESTful API. It seems like all the tutorials and documents make you generate and use client libraries if you need to use the API on the client side. I was wondering if it's possible for me to use the API by just using plain url request or Alamofire and get the result in JSON format? I am currently developing an Swift iOS app with