Le protocole HTTP: Client HTTP Java

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

public class Client {

  String proxy, host, url;
  int port;
  char[] buf;
  private final int BUF_SIZE = 8192;

  Client ( String params[] ) {
    proxy = params[0];
    port = (new Integer(params[1])).intValue();
    host = params[2];
    url = params[3];
    buf = new char[BUF_SIZE];
  }

  public void sendRequest() {
    Socket socketToWeb;
    PrintWriter toWeb;
    BufferedReader fromWeb;
    String str = "";
    int nb = 0;

    try {
      socketToWeb = new Socket(InetAddress.getByName(proxy),port);
      toWeb = new PrintWriter(
                  new BufferedWriter (
                      new OutputStreamWriter (
                          socketToWeb.getOutputStream())),true);
      fromWeb = new BufferedReader(
                  new InputStreamReader (
                          socketToWeb.getInputStream()));

      str = "GET "+url+" HTTP/1.1\r\nHost: "+host+"\r\n";

      toWeb.println(str);

      boolean echoing = true;

      int size = 0;
      while ( true ) {
       if ( echoing ) {
          str = fromWeb.readLine();
          if ( str == null ) break;
          if ( str.length() == 0 ) {
            echoing = false; // end of header
          }
          System.out.println(str);
       } else {
          for (int i=0;i<nb;buf[i++]=0x00);
          nb = fromWeb.read(buf,0,BUF_SIZE);
          if ( nb == -1 ) {
            int j=BUF_SIZE-1;
            while ( buf[j] == 0x00 && j > 0 )
              j--;
            break;
          }
          System.out.println(buf);
       }
      }
    } catch ( IOException e ) {}
  }

  public static void main(String args[]) throws IOException {
        Client c = new Client(args);
        c.sendRequest();
  }
}