code: func (r *Route) Methods(methods ...string) *Route {
  	for k, v := range methods {
  		methods[k] = strings.ToUpper(v)
  	}
  	return r.addMatcher(methodMatcher(methods))
  }
docs: // Methods adds a matcher for HTTP methods.
  // It accepts a sequence of one or more methods to be matched, e.g.:
  // "GET", "POST", "PUT".