go-hello-world-server.go

package main                                                                                                                                        

import (                                                                                                                                                                                                                                                                                                
    "fmt"                                                                                                                                           
    "log"     
    
    "net/http"
)                                                                                                                                                   

func rootHandler(w http.ResponseWriter, r *http.Request) {                                                                                          
    fmt.Fprint(w, "Hello, world!")                                                                                                                  
}                                                                                                                                                   

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