Currently, when you try to write a server with Go there are a form to register with http.Handle and a form to create an object with ServeMux and register Handle there.
What are the differences between the two?
When http.Handle receives an argument it registers with DefaultServeMux.
func Handle(pattern string, handler Handler) { DefaultServeMux.Handle(pattern, handler) }
What is this DefaultServe Mux? Actually it is written in the beginning of the document.
ListenAndServe starts an HTTP server with a given address and handler. The handler is usually nil, which means to use DefaultServeMux. Handle and HandleFunc add handlers to DefaultServeMux:
This is declared to the upper part of net / http package
// DefaultServeMux is the default ServeMux used by Serve.
var DefaultServeMux = &defaultServeMux
var defaultServeMux ServeMux
By looking at the declaration of defaultServeMux, it is ServeMux, so it becomes a difference whether you declare an object explicitly or use the default one as a result.
Is it to use it because you want to declare multiple objects etc. Basically, the default provided with http should be enough.