Sending post request with params and fetching response content

gistfile1.java

public static String post(String urlString, String params, int timeout) throws Exception {
    String response = null;
        
    HttpURLConnection conn = null;
    DataOutputStream dos = null;
    InputStream is = null;
    try {
        URL url = new URL(urlString);
        conn = (HttpURLConnection)url.openConnection();
        conn.setDoInput(true);
        conn.setDoOutput(true);
        conn.setConnectTimeout(timeout);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        conn.setRequestProperty("charset", "utf-8");
        conn.setRequestProperty("Content-Length", Integer.toString(params.getBytes().length));
        
        dos = new DataOutputStream(conn.getOutputStream());
        dos.writeBytes(params);
        dos.flush();
        
        is = conn.getInputStream();
        Scanner s = new Scanner(is).useDelimiter("\\A");
        response = s.hasNext() ? s.next() : null;
    } finally {
        if (dos != null) { 
            dos.close(); 
        }
        
        if (is != null) { 
            is.close(); 
        }
        
        if (conn != null) { 
            conn.disconnect(); 
        }
    }
    
    return response;
}