golang gin自定义中间件：context.Next()在多个自定义中间件中的使用

package main

import (
    "log"

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

func middleware1(c *gin.Context) {
    log.Println("middleware1 in ....")
    c.Set("key", 1000)
    log.Println("middleware1 before next ....")
    //c.Next()
    log.Println("middleware1 next after .....")
    log.Println("middleware1 done ....")
    c.JSON(200, gin.H{
        "msg": c.GetInt("key"),
    })
}

func middleware2(c *gin.Context) {
    log.Println("middleware2 in ....")
    log.Println("middleware2 before next ....")
    c.Next()
    log.Println("middleware2 next after .....")
    log.Println("middleware2 done ....")
}

func main() {
    r := gin.Default()
    r.Use(middleware1, middleware2)
    r.GET("ping", func(c *gin.Context) {
        log.Println("func in .....")
        k := c.GetInt("key") // 1000
        // 3000
        c.Set("key", k+2000)
        log.Println("func done .....")

    })
    r.Run()
}