Fixed Java POST request

package <package>;

import android.util.Log;

import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class HttpClient {
    public static String sendToken(String token){
        URL url;
        HttpURLConnection connection = null;
        try {
            JSONObject json = new JSONObject();
            json.put("token", token);
            byte[] sent_info = json.toString().getBytes();

            //Create connection
            url = new URL("<url>/register_token");
            connection = (HttpURLConnection)url.openConnection();
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-Type", "application/json");

            connection.setRequestProperty("Content-Length", "" +
                    Integer.toString(sent_info.length));
            connection.setRequestProperty("Content-Language", "en-US");

            connection.setUseCaches (false);
            connection.setDoInput(true);
            connection.setDoOutput(true);

            // Send POST output.
            DataOutputStream printout = new DataOutputStream(connection.getOutputStream());
            printout.write(sent_info);
            printout.flush();
            printout.close();

            //Get Response
            InputStream is = connection.getInputStream();
            BufferedReader rd = new BufferedReader(new InputStreamReader(is));
            String line;
            StringBuffer response = new StringBuffer();

            while((line = rd.readLine()) != null) {
                response.append(line);
                response.append('\r');
            }

            rd.close();
            return response.toString();

        } catch (Exception e) {
            Log.i(MainActivity.TAG, e.getMessage());
            return null;
        } finally {
            if(connection != null) {
                connection.disconnect();
            }
        }
    }
}