why is NoMethod marked as TODO

[togettoyou]

Description

What is the role of NoMethod , it does not seem to be effective

I found it is marked as TODO :

// NoMethod sets the handlers called when... TODO.
func (engine *Engine) NoMethod(handlers ...HandlerFunc) {
	engine.noMethod = handlers
	engine.rebuild405Handlers()
}

How to reproduce

package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"net/http"
)

func main() {
	r := gin.Default()
	r.NoRoute(func(c *gin.Context) {
		c.String(http.StatusOK, "NoRoute")
	})
	r.NoMethod(func(c *gin.Context) {
		fmt.Println("NoMethod")
		c.String(http.StatusOK, "NoMethod")
	})
	r.POST("/", func(c *gin.Context) {
		c.String(http.StatusOK, "/")
	})
	r.Run(":8080")
}

Expectations

$ curl http://localhost:8080
NoMethod

$ curl -X POST http://localhost:8080
/

$ curl -X PUT http://localhost:8080
NoMethod

Actual result

$ curl http://localhost:8080
NoRoute

$ curl -X POST http://localhost:8080
/

$ curl -X PUT http://localhost:8080
NoRoute

Environment

• go version: go version go1.17 windows/amd64
• gin version (or commit ref): v1.7.4
• operating system: windows/amd64

[togettoyou]

I found a way to turn it on ：engine.HandleMethodNotAllowed = true

[togettoyou]

So why is NoMethod marked as TODO?

[togettoyou]

Should HandleMethodNotAllowed be turned on when using NoMethod ?