A Tour of Go Web servers

Package http serves HTTP requests using any value that implementshttp.Handler:

package http

type Handler interface {
    ServeHTTP(w ResponseWriter, r *Request)
}

In this example, the type Hello implements http.Handler.

Visit http://localhost:4000/ to see the greeting.

Note: This example won‘t run through the web-based tour user interface. To try writing web servers you may want to Install Go.

package main 

import (
    "fmt"
    "net/http"
)

type Hello struct {}

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

func main() {
    var h Hello
    http.ListenAndServe("localhost:4000",h)
}

A Tour of Go Web servers

原文：http://www.cnblogs.com/ghgyj/p/4058196.html