Http原理实践 Go实现

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package mainimport (    "bytes"    "fmt"    "io"    "net"    "os")func main() {    if len(os.Args) != 2 {        fmt.Fprintf(os.Stderr, "Usage : %s host:post", os.Args[0])        os.Exit(1)    }    service := os.Args[1]    conn, err := net.Dial("tcp", service)    checkError(err)    _, err = conn.Write([]byte("HEAD /  HTTP/1.0\r\n\r\n"))    checkError(err)    result, err := readFully(conn)    checkError(err)    fmt.Println(string(result))    os.Exit(0)}func checkError(err error) {    if err != nil {        fmt.Fprintf(os.Stderr, "Fatal error : %s ", err.Error())        os.Exit(1)    }}func readFully(conn net.Conn) ([]byte, error) {    defer conn.Close()    result := bytes.NewBuffer(nil)    var buf [512]byte    for {        n, err := conn.Read(buf[0:])        result.Write(buf[0:n])        if err != nil {            if err == io.EOF {                break            }            return nil, err        }    }    return result.Bytes(), nil}

构建代码

go build simplehttp.go./simplehttp ip:port

返回值：

    HTTP/1.1 200 OK    Server: nginx/1.2.1    Date: Sat, 19 Mar 2016 07:17:26 GMT    Content-Type: text/html; charset=utf-8    Connection: close    X-Frame-Options: SAMEORIGIN

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