Adding middleware

Sometimes, you will need to create a lot of functions to handle HTTP requests, maybe serving different paths in a URL, all performing different actions. You might need to create a function to handle a server returning a list of users, one with a list of projects, a route for updating some details, and all the functions doing different things. It might happen, however, that although these functions perform different actions, they will also have something in common. A common example is when these functions have to be performed on a secured environment, which means only for users that have been logged in. Let’s look at a very simple example and consider the following two functions:

http.HandleFunc(
  "/hello1",
  func(w http.ResponseWriter,
  r *http.Request,
){
  msg := "Hello there, this is function 1"
  w.Write([]byte(msg))
})
http.HandleFunc(
  "/hello2",
  ...