需要iOS应用程序的基本服务器后端

I'm currently developing an iOS app and have reached the point where I need to implement a server backend in order to support the core functionality. Essentially, the app deals with text strings that need to be uploaded to a server. After receiving the strings, I need the server to perform some tasks with it and then send the result of the tasks (also string-based) back to the iPhone app.I'm currently developing an iOS app and have re