func (mx *Mux) Get(pattern string, handlerFn http.HandlerFunc) {
	mx.handle(mGET, pattern, handlerFn)
}
func (mx *Mux) Get(pattern string, handlerFn http.HandlerFunc) {
	mx.handle(mGET, pattern, handlerFn)
}
// Get adds the route `pattern` that matches a GET http method to
// execute the `handlerFn` http.HandlerFunc.