Loading animation for webhook?

I have a scenario that is triggered by a custom webhook (a user goes to a link).

the scenario takes about 20 seconds to complete (it does some calculations, creates a custom .html , then redirects user to that link).

I would like to have some loading animation within those 20 seconds, so that the customer knows that ‘something is happening’.

Is this possible?

This is done on the web page that calls the webhook.

If you link to/send a user directly to the webhook address without using a web page to call the webhook, then you can’t display anything since it’s a direct server request.

The “loading animation” in this case will be whatever the user’s web browser implements.

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