Name: rm29839			Date: 12/16/97


1 make HTTP URLConnection
  send request
  server reply right respose
  send second request
  server close keep-alive connection
  HTTP URLConnection automatically resend request
  but does not send message body

2 demo source
  (including client & server)

import java.io.*;
import java.net.*;

public class Http3 {
    static final String HOST = "localhost";
    static final int PORT = 1000;
    static final int MAX = 30;
    static final int SIZE = 10000;
    static class Server extends Thread {
	Server() {
	}
	public void run() {
	    ServerSocket ss;
	    try {
		ss = new ServerSocket(PORT);
	    } catch (IOException e) {
		System. out.println("ServerSocket IOException");
		return;
	    }
	    try {
		Socket socket = ss.accept();
		DataInputStream dis = new DataInputStream(socket.getInputStream());
		PrintWriter pw = new PrintWriter(socket.getOutputStream());

		String head;
		for (;;) {
		    head = dis.readLine();
		    System.out.println(head);
		    if (head.equals("")) break;
		}
		String str = dis.readLine();
		System.out.println(str);
		pw.print("HTTP/1.0 200 OK\r\n");
		pw.print("Connection: keep-alive\r\n");
		pw.print("Content-length: 12\r\n");
		pw.print("\r\n");
		pw.print("0123456789\r\n");
		pw.flush();

		head = dis.readLine();
		System.out.println(head);
		dis.close();

		socket = ss.accept();
		dis = new DataInputStream(socket.getInputStream());
		pw = new PrintWriter(socket.getOutputStream());
		head = dis.readLine();
		if (head == null) {
		    System.out.println("head == null");
		    dis.close();
		    ss.close();
		    return;
		}
		System.out.println(head);
		for (;;) {
		    head = dis.readLine();
		    System.out.println(head);
		    if (head.equals("")) break;
		}
		str = dis.readLine();
		System.out.println(str);
		pw.print("HTTP/1.0 200 OK\r\n");
		pw.print("Connection: keep-alive\r\n");
		pw.print("Content-length: 12\r\n");
		pw.print("\r\n");
		pw.print("0123456789\r\n");
		pw.flush();
		dis.close();
		ss.close();
	    } catch (IOException e) {
		System. out.println("IOException");
	    }
	}
    }

    public static void main(String args[]) {
	Server server = new Server();
	server.setDaemon(true);
	server.start();
	try {
	    URL url = new URL("http", HOST, PORT, "/file");
	    URLConnection uc = url.openConnection();
	    uc.setDoOutput(true);
	    OutputStream os = uc.getOutputStream();
	    PrintWriter pw = new PrintWriter(os);
	    pw.print("ABCDEFGH\r\n");
	    pw.close();
	    System.out.println("os.close");
	    BufferedReader br = new BufferedReader(new InputStreamReader(uc.getInputStream()));
	    System.out.println("getInputStream");
	    String str = br.readLine();
	    System.out.println(str);
	    br.close();

	    uc = url.openConnection();
	    uc.setDoOutput(true);
	    os = uc.getOutputStream();
	    pw = new PrintWriter(os);
	    pw.print("ABCDEFGH\r\n");
	    pw.close();
	    System.out.println("os.close");
	    br = new BufferedReader(new InputStreamReader(uc.getInputStream()));
	    System.out.println("getInputStream");
	    str = br.readLine();
	    System.out.println(str);
	    br.close();
	} catch (MalformedURLException e) {
	    System.out.println("MalformedURLException");
	} catch (IOException e) {
	    System.out.println("IOException");
	}
    }
}

3 no error message
  server waits for message body!

4 no
5 no
(Review ID: 21946)
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