Creating a Gnutella downloading application in Java

Question

Hi I am trying to create an application in Java that is able to simplly download a file from a remote host using the Gnutella (peer-2-peer) protocol. The application accepts 3 arguments:
1 host (IP address or hostname)
2 port (the remote gnutella application is listening on)
3 ss1hash (unique code for the desired file)
Gnutella file transfers work by sending HTTP get request headers to the remote host, which includes the information from the arguments.
This is the application i have created so far...:
import java.io.*;
import java.net.*;
public class GnuttDownloader{
        public static void main(String[] args) throws IOException{
                String host;
                int port;
                host = args[0];
                port = Integer.parseInt(args[1]);
                String sha1Hash;
                sha1Hash = args[2];
                Socket socket=null;
                System.out.println("Starting Downloader...");
                try {
                      socket = new Socket(host, port);
                  // Send request to get root
                  // Be sure to end string with two sets of carriage
                  // return - newline characters.
                  OutputStream outputStream =
                      socket.getOutputStream();
                  PrintWriter out = new PrintWriter(outputStream);
                 out.print ("GET /uri-res/N2R?" + sha1Hash + " HTTP/1.1\r\n"
                            + "User-Agent: Limewire/3.3.5\r\n"
                            + "Host: " + host + ":" + port + "\r\n"
                            + "Connection: Keep-Alive\r\n"
                            + "Range: bytes=0-\r\n\r\n");
                  out.flush();
                  // Fetch response
           InputStream inputStream =
             socket.getInputStream();
           InputStreamReader inputStreamReader =
             new InputStreamReader(inputStream);
           BufferedReader in =
             new BufferedReader(inputStreamReader);
           String response;
           while ((response = in.readLine()) != null) {
             System.out.println(response);
           System.out.print("ARGUMENTS:\nHost: " + host + "\n"
   + "port: " +port + "\nFile's sha1 code: "  + sha1Hash);
           // Close everything
           out.close();
           in.close();
           socket.close();
         } catch (IOException e) {
           System.err.println("Problems talking to " + host + " on port:" + port);
           e.printStackTrace();
     }I have not implemented the file reading/saving part yet, but the application should at least give me a response such as:
HTTP/1.1 200 OK
Server: Gnutella
Content-type: application/binary
Content-length: 4356789
this should verify that it accepts my request, and i should expect a file to be delivered about 4MB long. However this does not happen.
The application manages to connect to a remote host i.e. if I specify a host on my LAN (192.168.0.3) running LimeWire 3.3.5, but instead of receiving the above response, I receive the follwing:
HTTP/1.1 400 Malformed Request
Server: LimeWire/3.3.5
Content-Type: text/plain
Content-Length: 17
Connection: close
Malformed Request
Therefore, i know it is connecting and sending the header, but it seems that it is not understanding the actual header that I send. I can't see anything wrong with it, is there anything that I am doing wrong? Has anyone done anyting like this?Can anyone help me here?
Thanks in advance.

Answer 1

If anyone can help here please????????????????????????????????