A Tour of Go - Exercise: HTTP Handlers http://tour.golang.org/#58

http_handlers.go

package main

import (
    "fmt"
    "net/http"
)


type String string

func (s String) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    fmt.Fprint(w, s)
}


type Struct struct {
    Greeting string
    Punct string
    Who string
}

func (s *Struct) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    fmt.Fprint(w, s.Greeting, s.Punct, s.Who)
}


func main() {
    http.Handle("/string", String("I'm a frayed knot."))
    http.Handle("/struct", &Struct{"Hello", ":", "Gophers!"})
    http.ListenAndServe("localhost:4000", nil)
}