// Sample program to show how to write a simple version of curl using
// the io.Reader and io.Writer interface support.
package main

import (
    "fmt"
    "io"
    "net/http"
    "os"
)

// init is called before main.
func init() {
    if len(os.Args) != 2 {
        fmt.Println("Usage: ./example2 <url>")
        os.Exit(-1)
    }
}

// main is the entry point for the application.
func main() {
    // Get a response from the web server.
    r, err := http.Get(os.Args[1])
    if err != nil {
        fmt.Println(err)
        return
    }

    // Copies from the Body to Stdout.
    io.Copy(os.Stdout, r.Body)
    if err := r.Body.Close(); err != nil {
        fmt.Println(err)
    }
}

go run test.go http://www.baidu.com