mux.go
func (mx *Mux) Method(method, pattern string, handler http.Handler) {
	m, ok := methodMap[strings.ToUpper(method)]
	if !ok {
		panic(fmt.Sprintf("chi: '%s' http method is not supported.", method))
	}
	mx.handle(m, pattern, handler)
}
func (mx *Mux) Method(method, pattern string, handler http.Handler) {
	m, ok := methodMap[strings.ToUpper(method)]
	if !ok {
		panic(fmt.Sprintf("chi: '%s' http method is not supported.", method))
	}
	mx.handle(m, pattern, handler)
}
// Method adds the route `pattern` that matches `method` http method to
// execute the `handler` http.Handler.