Stage3: I don't get 200 Http response, just the int variable declared. All permissions present. What am I doing wrong?

protected String[] mBlogPostTitles;
public static final int NUMBER_OF_POSTS = 20;
public static final String TAG = MainListActivity.class.getSimpleName();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_list);

    if (isNetworkAvailable()) {
        GetBlogPostTask getBlogPostTask = new GetBlogPostTask();
        getBlogPostTask.execute();

    }
    else {
        Toast.makeText(this, "Network is Unavailable", Toast.LENGTH_LONG).show();
    }

    //Toast.makeText(this, getString(R.string.no_items), Toast.LENGTH_LONG).show();

}

private boolean isNetworkAvailable() {
    ConnectivityManager manager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo networkInfo = manager.getActiveNetworkInfo();

    boolean isAvailable = false;
            if (networkInfo != null && networkInfo.isConnected()){
        isAvailable = true;
    }
    return isAvailable;
    }


private class GetBlogPostTask extends AsyncTask<Object, Void, String> {

    @Override
    protected String doInBackground(Object[] objects) {
        int responseCode = -1;

        try {
        URL blogFeedUrl = new URL("http://blog.teamtreehouse.com/api/get_recent_summary/?count=" + NUMBER_OF_POSTS);
        HttpURLConnection connection = (HttpURLConnection) blogFeedUrl.openConnection();
        connection.connect();


        Log.i(TAG, "Code:" + responseCode);
    }
    catch(MalformedURLException e) {
        Log.e(TAG, "Exception caught: ", e);
    }
    catch (IOException e){
        Log.e(TAG, "Exception caught: ", e);
    }
    catch (Exception e){
        Log.e(TAG, "Exception caught: ", e);
    }
        return "Code:" + responseCode;
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main_list, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}