protection against refresh spam ?

[TheLastSuperman]

The script you provided blocks the Ctrl+R key combination, which is commonly used to refresh a page. However, it doesn't block the F5 key, which is also commonly used for refreshing. Additionally, relying solely on JavaScript for security or anti-spam measures is not foolproof, as users can disable JavaScript or bypass it using browser developer tools.

Here's an improved version of your script that blocks both F5 and Ctrl+R:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
    $(document).on("keydown", function(e) {
        if (e.which == 116 || (e.ctrlKey && e.which == 82)) { // 116 is F5, 82 is 'R' key
            e.preventDefault();
            e.stopPropagation();
        }
    });
});
</script>

However, while this script can deter casual users from constantly refreshing the page, it's not a robust solution against determined users or bots. Here are some additional measures you can consider:

• Server-Side Rate Limiting: Implement rate limiting on your server to prevent clients from making too many requests in a short period of time. This is a more robust solution as it doesn't rely on client-side behavior.
• Caching: Use caching mechanisms to serve static content, reducing the load on your server.
• User Feedback: Provide feedback to users when they refresh too often, such as a warning message.
• Monitoring & Analytics: Monitor user behavior on your site. If you notice patterns of abuse, you can take appropriate action.
• CAPTCHA: If you suspect bot activity, consider implementing a CAPTCHA challenge after a certain number of refreshes.

Remember, while client-side measures can be helpful, they can be bypassed. Server-side measures are more robust and harder to circumvent.