http-server

package main

import (
    "net/http"
    "strings"
)

func sayHello(w http.ResponseWriter, r *http.Request) {
    name := "World"
    url := strings.Trim(r.RequestURI, "/")
    if len(url) > 0 {
        name = strings.Split(url, "/")[0]
        name = strings.ToUpper(name[0:1]) + name[1:] // change first symbol to Uppercase
    }
    w.Write([]byte("Hello, " + name + "!"))
}

func main() {
    http.HandleFunc("/", sayHello)
    err := http.ListenAndServe(":80", nil)
    if err != nil {
        panic(err.Error())
    }
}