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Ping embeded comments

Hello all,
I am integrating comments into one of my external sites and I seem to be runing into a situation. Sometimes the comments try to load up before the database finishes updating leaving me with an 404 error in place of the comments.

Since the iframe is generated via JS I really do not have any way to peeking into the frame to see if specific elements exist or to capture the http status code.

Does anyone know of a way to ping the comment thread directly to see if its a 200?

Vanilla version: 2.1.x

embed code:

/*** Required Settings: Edit BEFORE pasting into your web page ***/
var vanilla_forum_url = ''; // The full http url & path to your vanilla forum
var vanilla_identifier = 'discussion id"'; // Your unique identifier for the content being commented on

/*** Optional Settings: Ignore if you like ***/
 var vanilla_discussion_id = 'discussion id'; // Attach this page of comments to a specific Vanilla DiscussionID.
// var vanilla_category_id = ''; // Create this discussion in a specific Vanilla CategoryID.

(function() {
    var vanilla = document.createElement('script');
    vanilla.type = 'text/javascript';
    var timestamp = new Date().getTime();
    vanilla.src = vanilla_forum_url + '/js/embed.js';
    (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(vanilla);
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