mainHttp.go

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", viewHandler)
    http.ListenAndServe(":8080", nil)
}

func viewHandler(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-type", "text/plain")
    fmt.Fprintf(w, "Hello World")
}