This class shows you how to post against a grid servlet and get information.

NodeInfoFromGrid

package raw.selenium;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;

import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHttpRequest;
import org.json.JSONException;
import org.json.JSONObject;
import org.testng.Assert;

public class NodeInfoFromGrid {
	
	static String hubHost = "localhost";
	static int hubPort = 4444;

	public static void main(String[] args) throws ClientProtocolException, IOException, JSONException {
		URL  proxyApi = new URL("http://" + hubHost + ":" + hubPort + "/grid/admin/MyConsoleServlet");
		HttpClient client = new DefaultHttpClient();
		BasicHttpRequest r = new BasicHttpRequest("GET", proxyApi.toExternalForm());
		HttpHost host = new HttpHost(hubHost, hubPort);
		HttpResponse response = client.execute(host, r);
		Assert.assertEquals(200, response.getStatusLine().getStatusCode());
	    JSONObject o = extractObject(response);
	    System.out.println(o);

	}
	
	private static JSONObject extractObject(HttpResponse resp) throws IOException, JSONException {
	    BufferedReader rd = new BufferedReader(new InputStreamReader(resp.getEntity().getContent()));
	    StringBuilder s = new StringBuilder();
	    String line;
	    while ((line = rd.readLine()) != null) {
	      s.append(line);
	    }
	    rd.close();
	    return new JSONObject(s.toString());
	  }
}

This class can be used to post against a Servlet as shown in the gist : https://gist.github.com/3302497