Go Server 監聽後如何啟動瀏覽器？

import (
    // Standard library packages
    "fmt"
    "log"
    "net"
    "net/http"

    // Third party packages
    "github.com/skratchdot/open-golang/open"
    "github.com/julienschmidt/httprouter"
)

func main() {
    // Instantiate a new router
    r := httprouter.New()

    // Add a handler on /test
    r.GET("/test", func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
        // Simply write some test data for now
        fmt.Fprint(w, "Welcome!\n")
    })

    // Open a TCP listener on port 3000
    l, err := net.Listen("tcp", "localhost:3000")
    if err != nil {
        log.Fatal(err)
    }

    // Start the browser to connect to the server
    err = open.Start("http://localhost:3000/test")
    if err != nil {
        log.Println(err)
    }

    // Start the blocking server loop
    log.Fatal(http.Serve(l, r))
}