golang web

package main
import (
        "io"
        "net/http"
        "log"
)

func HelloServer(w http.ResponseWriter, req *http.Request) {
        io.WriteString(w, "hello, world!\n")
}

func main() {
        http.HandleFunc("/hello", HelloServer)
        err := http.ListenAndServe(":8080", nil)
        if err != nil {
                log.Fatal("ListenAndServe: ", err)
        }
}