Update vendor

vendor/github.com/facebookgo/httpdown/httpdown_example/main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/facebookgo/httpdown"
+)
+
+func handler(w http.ResponseWriter, r *http.Request) {
+	duration, err := time.ParseDuration(r.FormValue("duration"))
+	if err != nil {
+		http.Error(w, err.Error(), 400)
+		return
+	}
+	fmt.Fprintf(w, "going to sleep %s with pid %d\n", duration, os.Getpid())
+	w.(http.Flusher).Flush()
+	time.Sleep(duration)
+	fmt.Fprintf(w, "slept %s with pid %d\n", duration, os.Getpid())
+}
+
+func main() {
+	server := &http.Server{
+		Addr:    "127.0.0.1:8080",
+		Handler: http.HandlerFunc(handler),
+	}
+	hd := &httpdown.HTTP{
+		StopTimeout: 10 * time.Second,
+		KillTimeout: 1 * time.Second,
+	}
+
+	flag.StringVar(&server.Addr, "addr", server.Addr, "http address")
+	flag.DurationVar(&hd.StopTimeout, "stop-timeout", hd.StopTimeout, "stop timeout")
+	flag.DurationVar(&hd.KillTimeout, "kill-timeout", hd.KillTimeout, "kill timeout")
+	flag.Parse()
+
+	if err := httpdown.ListenAndServe(server, hd); err != nil {
+		panic(err)
+	}
+}