This is a simple and graceful HTTP server for Golang.

V1.2.0 (Require Go 1.8+)

package main import ( "fmt" "net/http" "github.com/tabalt/gracehttp" ) func main() { http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "hello world") }) err := gracehttp.ListenAndServe(":8080", nil) if err != nil { fmt.Println(err) } } 

1. Install the demo application

    go get github.com/tabalt/gracehttp/gracehttpdemo 

2. Start it in the first terminal

    gracehttpdemo 

   This will output something like:

    2015/09/14 20:01:08 Serving :8080 with pid 4388. 

3. In a second terminal start a slow HTTP request

    curl 'http://localhost:8080/sleep/?duration=20s' 

4. In a third terminal trigger a graceful server restart (using the pid from your output):

    kill -SIGUSR2 $pid 

5. Trigger another shorter request that finishes before the earlier request:

    curl 'http://localhost:8080/sleep/?duration=0s'