public byte[] fetch(URL proxyURL) throws Exception {
	System.out.println("fetching " + proxyURL.toString() + " using proxy at " +
		proxyHost + ":" + proxyPort);
	Socket sock = new Socket(proxyHost, proxyPort);

	InputStream in = sock.getInputStream();
	DataInputStream urlData = new DataInputStream(in);
	OutputStream out = sock.getOutputStream();
	PrintStream cmdStream = new PrintStream(out);

	// fetch past the first line
	urlData.readLine();

	// send a PROXY command
	cmdStream.println("PROXY " + proxyURL.toString());

	// get the status
	String cmdResult = urlData.readLine();
	System.out.println(cmdResult);
	if (cmdResult.regionMatches(0, "+OK", 0, 3)) {
		int contentLength = Integer.parseInt(urlData.readLine().substring(17));
		byte[] dataBuffer = new byte[contentLength];
		byte[] chunk = new byte[512];
		int count;
		int bytesRead = 0;

		// fetch the whole piece of data into a byte array
		while (bytesRead <= contentLength) {
			count=urlData.read(chunk);
			bytesRead += count;
			byte[] t= new byte[dataBuffer.length + count];
			System.arraycopy(dataBuffer, 0, t, 0, dataBuffer.length);
			System.arraycopy(chunk, 0, t, dataBuffer.length, count);
			dataBuffer= t;
		}

		// send a QUIT command
		cmdStream.println("QUIT");
		sock.close(); 	
		return dataBuffer;
	}
	else {
		sock.close();
		throw new Exception("proxy error: " + cmdResult);
	}
}