HTTP Request in Java

String res = null;
HttpURLConnection conn;

try {
    // Set this to a string to send post data.
    String postData = null;

    // Open the connection
    conn = (HttpURLConnection)(new URL("http://inspirontrance.com/app.php")).openConnection();

    // Optionally set a timeout for the request:
//  conn.setConnectTimeout(10000); // 10 seconds

    // Add headers:
//  conn.addRequestProperty("Cookie", "a=b");

    // Replace a header: (use this when you don't have multiple headers with the same key, eg. Cookie)
//  conn.setRequestProperty("Authorization", "AuthHeader Value");

    if(postData != null) { // If post data is set
        // Set the method to POST
        conn.setRequestMethod("POST");

        // Allow us to write to the connection
        conn.setDoOutput(true);

        // Write
        OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
        writer.write(postData);
        writer.flush();

        // A little trick, using Scanner for converting the input stream to a string
        Scanner s = new Scanner(conn.getInputStream());
        s.useDelimiter("\\A");
        res = s.hasNext() ? s.next() : "";
        s.close();
    }
    else { // No post data, do simple GET.
        conn.setRequestMethod("GET");

        // Scanner trick
        Scanner s = new Scanner(conn.getInputStream());
        s.useDelimiter("\\A");
        res = s.hasNext() ? s.next() : "";
        s.close();
    }
} catch (MalformedURLException e) {
    // The URL is not valid
    return;
} catch (IOException e) {
    // Something went wrong with the connection
    try {
        // Trying to read the HTTP status code, 404 for example
        int statusCode = conn.getResponseCode();

        // Do something with the status code here. Or don't.
    } catch (IOException e1) {}
    return;
}