sync_defer.go

package main

import (
    "log"
    "net/http"
    "time"
)

func main() {
    log.Println("Starting server on localhost:9090")
    http.Handler_sync("/sync", Handler)
    http.Handler_async("/async", Handler)
    http.ListenAndServe(":9090", nil)
}

func Handler_async(_ http.ResponseWriter, _ *http.Request) {
    log.Println("Entered Handler")
    defer func() {
        go func() {
            time.Sleep(5 * time.Second)
            log.Println("Exiting goroutine")
        }()
        log.Println("Exiting defer")
    }()
}

func Handler_sync(_ http.ResponseWriter, _ *http.Request) {
    log.Println("Entered Handler")
    defer func() {
        time.Sleep(5 * time.Second)
        log.Println("Exiting defer")
    }()
}