mux.go
func (mx *Mux) Handle(pattern string, handler http.Handler) {
	mx.handle(mALL, pattern, handler)
}
func (mx *Mux) Handle(pattern string, handler http.Handler) {
	mx.handle(mALL, pattern, handler)
}
func ( mx * Mux ) Handle ( pattern string , handler http . Handler ) { mx . handle ( mALL , pattern , handler ) }
// Handle adds the route `pattern` that matches any http method to
// execute the `handler` http.Handler.
Handle adds the route pattern that matches any http method to execute the handler http . Handler .