Building Microservices with Go

Routing in net/http

Even a simple microservice will need the capability to route requests to different handlers dependent on the requested path or method. In Go this is handled by the DefaultServeMux method which is an instance of ServerMux. Earlier in this chapter, we briefly covered that when nil is passed to the handler parameter for the ListenAndServe function then the DefaultServeMux method is used. When we call the http.HandleFunc("/helloworld", helloWorldHandler) package function we are actually just indirectly calling http.DefaultServerMux.HandleFunc(…).

The Go HTTP server does not have a specific router instead any object which implements the http.Handler interface is passed as a top level function to the Listen() function, when ...