code: func (s *HTTPServer) OperatorKeyringEndpoint(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
  	var args keyringArgs
  	if req.Method == "POST" || req.Method == "PUT" || req.Method == "DELETE" {
  		if err := decodeBody(req, &args, nil); err != nil {
  			resp.WriteHeader(http.StatusBadRequest)
  			fmt.Fprintf(resp, "Request decode failed: %v", err)
  			return nil, nil
  		}
  	}
  	s.parseToken(req, &args.Token)
  
  	// Parse relay factor
  	if relayFactor := req.URL.Query().Get("relay-factor"); relayFactor != "" {
  		n, err := strconv.Atoi(relayFactor)
  		if err != nil {
  			resp.WriteHeader(http.StatusBadRequest)
  			fmt.Fprintf(resp, "Error parsing relay factor: %v", err)
  			return nil, nil
  		}
  
  		args.RelayFactor, err = ParseRelayFactor(n)
  		if err != nil {
  			resp.WriteHeader(http.StatusBadRequest)
  			fmt.Fprintf(resp, "Invalid relay factor: %v", err)
  			return nil, nil
  		}
  	}
  
  	// Switch on the method
  	switch req.Method {
  	case "GET":
  		return s.KeyringList(resp, req, &args)
  	case "POST":
  		return s.KeyringInstall(resp, req, &args)
  	case "PUT":
  		return s.KeyringUse(resp, req, &args)
  	case "DELETE":
  		return s.KeyringRemove(resp, req, &args)
  	default:
  		return nil, MethodNotAllowedError{req.Method, []string{"GET", "POST", "PUT", "DELETE"}}
  	}
  }
docs: // OperatorKeyringEndpoint handles keyring operations (install, list, use, remove)