使用Golang构建服务器，但客户端存在问题

Question

This is my code:

package main

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

const RECV_BUF_LEN = 1024

func handler(w http.ResponseWriter, r *http.Request) {
        fmt.Fprint(w, "Test")
}

func main() {
        http.HandleFunc("/", handler)
        s := &http.Server{Addr: ":8080", Handler: nil}
        listener, err := net.Listen("tcp", s.Addr)
        if err != nil {
                fmt.Println("Error: ", err.Error())
                fmt.Println("Close Server")
                os.Exit(1)
        }

        for {
                conn, err := l.Accept()
                if err != nil {
                        fmt.Println("Error: ", err.Error())
                        continue
                }
                go ClientLogic(conn)
        }
}

func ClientLogic(conn net.Conn) {
        fmt.Println("Connect Successful")
        conn.Close()
}

I know I can use following code to build a server but I want do some stuffs, such as printing some datas.

http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)

When the code run, the server-side can print "Connect Successful" successfully.

However, the it doesn't display anything in client-side.

In other words, the client's browser display anything and keep loading but the server-side can display the message about connecting successfully.

PS: The code refer to http://lolikitty.pixnet.net/blog/post/148420590 and the golang's source code ( http://golang.org/src/pkg/net/http/server.go?s=50405:50451#L1684 )

Answer 1

You should use the handler or the accept, but if you use the accept this will be handled the new connection and you are ignoring the handler. You are going to a lower abstraction level of the http connection.

This piece of code work as you expect:

package main

import (
    "fmt"
    "net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprint(w, "Test")
    fmt.Println("Connect Successful")
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

When you call to ListenAndServe, he make the correct Accept so you dont need to worry about.