Socket sock = new Socket();
InetSocketAddress remoteProxyAddress = new InetSocketAddress(proxy ip, proxy port);
sock.connect(remoteProxyAddress, connTimeout);

InputStream in = sock.getInputStream();
OutputStream out = sock.getOutputStream();

out.write(0x04);
out.write(0x01);
out.write((endpoint.getPort() >> 8) & 0xff);
out.write((endpoint.getPort() >> 0) & 0xff);
out.write(endpoint.getAddress().getAddress());
out.write(0x0);
out.flush();