Don't kill the request! - https://stackoverflow.com/questions/51579812/my-graceful-stop-http-listenandserve-fails

app.go

package main

import (
	// "encoding/json"
	"context"
	"fmt"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/gorilla/mux"
	log "github.com/sirupsen/logrus"
)

func getEnv(key, fallback string) string {
	value, exists := os.LookupEnv(key)
	if exists {
		return value
	}
	return fallback
}

func newRouter() *mux.Router {
	r := mux.NewRouter()
	r.HandleFunc("/about", handler).Methods("GET")
	return r
}

func init() {
	log.SetOutput(os.Stdout)
}

func main() {
	log.Infof("Starting (PID %d)...", os.Getpid())

	stop := make(chan os.Signal, 1)
	signal.Notify(stop, syscall.SIGTERM)
	signal.Notify(stop, syscall.SIGINT)

	listenAt := fmt.Sprintf("%s:%s", getEnv("HOST", "127.0.0.1"), getEnv("PORT", "8000"))

	r := newRouter()
	h := &http.Server{Addr: listenAt, Handler: r}

	go func() {
		log.Info("Serving on http://", listenAt)

		if err := h.ListenAndServe(); err != nil {
			log.Fatal(err)
		}
	}()
	<-stop

	log.Info("Stoping ...")
	h.Shutdown(context.Background())
	log.Info("Bye :)")
}

func handler(w http.ResponseWriter, r *http.Request) {
	time.Sleep(5 * time.Second)
	log.Info("new request")
	fmt.Fprintf(w, "Hola!")
}