Go powerful development server simple example:

 packagemain 
 import" net / http "
 funcSayHello (whttp.ResponseWriter, r * http.Request) {
     w.Write ([] byte (" hello ")) 
} 
 funcmain () {
     http.HandleFunc (" / hello ", SayHello ()) 
     http.ListenAndServe (": 1234 ", nil) 
} 
 listenAndServer listening port 
 handlefunc registration path handler 
 handler for sayhello