code: 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)
  }
docs: // Method adds the route `pattern` that matches `method` http method to
  // execute the `handler` http.Handler.