Gin Unregistered routes will trigger global middleware

• With issues: Unregistered routes will trigger global middleware

Description

If an unregistered route enters, 404 should be returned directly, but the middleware will be triggered.

How to reproduce

package main

import (
    "fmt"
    "os"
    "os/signal"

    "github.com/gin-gonic/gin"
)

func middle(c *gin.Context) {
    fmt.Println("do middleware")
}

func InitRouter() *gin.Engine {
    gine := gin.New()
    gine.NoRoute(func(ctx *gin.Context) {
        ctx.AbortWithStatus(404)
    })
    gine.Use(middle)
    gine.GET("/lala", func(ctx *gin.Context) {
        ctx.JSON(200, map[string]string{"msg": "ok"})
    })
    return gine
}
func main() {
    ch := make(chan os.Signal, 1)
    signal.Notify(ch, os.Interrupt)
    go func() {
        <-ch
        fmt.Println("\nexited")
        os.Exit(1)
    }()
    gin.SetMode(gin.ReleaseMode)
    router := InitRouter()
    fmt.Println(router.Run(":2002"))
}

Expectations

$ curl $host:2002/greet
terminal will not output 'do middleware'

Actual result

$ curl $host:2002/greet
terminal will output 'do middleware'

Comment From: Rishikesh01

Hi, @oswaldoooo this is an expected behavior of gin as middleware is just another handler , IMO this is not a bug but a design choice of Gin.

Comment From: brandon1024

Seconded @Rishikesh01 's comment. This is expected. This allows middleware to handle or modify requests that are not specifically registered with the engine but still expected to be handled.