why serverScoket.accept() execute several times about only one request

Question

I am learning the book how tomcat works and find a thing which make me a big surprise. I simplify the code as below:

public class Boot {
    public static void main(String[] args) {
        ServerDemo server = new ServerDemo();
        try {
            server.start();
            System.in.read();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
   }
}

---

public class ServerDemo implements Runnable {
    private ServerSocket serverSocket = null;
    public void run() {
        while (true) {
            Socket socket = null;
            try {
                socket = serverSocket.accept();
                System.out.println("--receive request from client----"+
                    Thread.currentThread().getId());
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public void start() {
        try {
            serverSocket = new ServerSocket(8080);
            Thread thread = new Thread(this);
            thread.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

the Boot class is Main class and used to boot this application and the ServerDemo class is a simplified server which listen 8080 port and will print info when a request from browser reach. Now the question is that: I think when I make a request from browser it will execute

socket = serverSocket.accept();

and then print info only once and then thread block itself because of accept method waiting the next request.

But the real is that the thread print info several times:(maybe 3,4..) about a request.

and this is a executing: input:

http://localhost:8080/index

output:

--receive request from client----13
--receive request from client----13
--receive request from client----13

my expected output:

--receive request from client----number

summary: I cant figure out about one request why it prints several times it means accept method execute several times.

Answer 1

Its probably your browser trying a few different things to get you to response cause you just closed the connection on them. Try using curl or wget instead. – ug_