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'