In Chapter 3, you used the UnityWebRequest class as a client to access data stored on a website (the server). The UnityWebRequest class handled all the underlying communication with the web server. This included the use of HTTP (HyperText Transport Protocol) to format messages and deconstruct the data returned from the server.
HTTP is quite a heavy protocol and is not recommended for games beyond its use at fetching leaderboards, or for updating a player’s save ...