Adds v46 command

main.go

@@ -0,0 +1,41 @@
+// command v46 serves http on various network types
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"time"
+)
+
+const resp = `{"ok": true}
+`
+
+var port = flag.Int("port", 8400, "listening port")
+var both = flag.Bool("both", false, "listen on ipv4 and ipv6")
+var dur = flag.Duration("dur", 10*time.Second, "how long to sleep before giving a request")
+
+func main() {
+	flag.Parse()
+	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+		time.Sleep(*dur)
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprintf(w, resp)
+	})
+
+	a := fmt.Sprintf(":%d", *port)
+	log.Printf("listening on: %+v", a)
+	proto := "tcp4"
+	if *both {
+		proto = "tcp"
+	}
+	l, err := net.Listen(proto, a)
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+	if err := http.Serve(l, nil); err != nil {
+		panic(err)
+	}
+}