Simple routing

The server we built in the previous exercise doesn’t do much – it just responds with a message; we cannot ask anything else. Before we can make our server more dynamic, let’s imagine we want to create an online book and we want to be able to select a chapter just by changing the URL. At the moment, if we browse the following pages, we’ll always see the same message:

http://localhost:8080
http://localhost:8080/hello
http://localhost:8080/chapter1

Now, we want to associate different messages with these different paths on our server. We will do this by introducing some simple routing to our server.

A path is what you see after 8080 in the URL, where 8080 is the port number we chose to run the server on. This path can be one number, a word, a set of numbers, or character groups separated by a /. To do this, we will use another function of the net/http package:

HandleFunc(pattern string, handler func(ResponseWriter, *Request))

Here...