Retrieve geographic data via an HTTP request via Google Maps URL

Good morning guys.

I'm trying to retrieve some geographic information based on latitude and longitude.

To retrieve such information I'm trying to make a request via URL through this link: Google Maps Geolocation API . It returns me an XML where I can work on it.

When creating this service in my web service, I uploaded it to the developing Weblogic server (running in LINUX system) and it returns the following error when executing it:

java.io.FileNotFoundException: Response: '502: Bad Gateway' for url: 'http://maps.google.com/maps/api/geocode/xml?latlng=-15.8040195453225%2C-47.8799401993617'

I have tried it in many ways, but it still gives the same error. I am using Google's own code to perform the consumption of information, as follows:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLEncoder;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;

public class GeocodeProcessor {

    private static final String GEOCODE_REQUEST_PREFIX = "http://maps.google.com/maps/api/geocode/xml";

    private static final int PROXY_PORT                 = 3128;
    private static final String PROXY_HOST              = "vampre.funasa.gov";
    private static final int TIMEOUT                    = 30000;


    public static void main() throws IOException,
            URISyntaxException, ParserConfigurationException, SAXException {

        String urlString = null;

        urlString = GEOCODE_REQUEST_PREFIX + "?latlng=" + URLEncoder.encode("-15.8040195453225,-47.8799401993617", "UTF-8");
        System.out.println(urlString);

        // Convert the string to a URL so we can parse it
        URL url = new URL(urlString);

        Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(
                PROXY_HOST, PROXY_PORT));

        HttpURLConnection conn = (HttpURLConnection) url.openConnection(proxy);
        conn.setConnectTimeout(TIMEOUT);
        conn.setRequestMethod("GET");
        conn.setRequestProperty("Accept", "application/xml");

        try {
            // open the connection and get results as InputSource.
            conn.connect();
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),
                    "UTF-8"));

            String line = null;
            StringBuilder ab = new StringBuilder();
            while( ( line = reader.readLine() ) != null )  {
                ab.append(line);
            }
            reader.close();

            System.out.println(ab.toString());

        } finally {
            conn.disconnect();
        }
    }

}

An aid would be extremely useful now. Vlw galerinha.