Captcha and any form of page caching don't get along. I understand why this is, but i'm wondering if there might be a certain setup to use captcha even in cached environments.
Post requests for example are not cached in most cases. So using a captcha on a separate page right after the form submission that you intend to spam-protect should be possible in this case. Your first submission will only be validated if your captcha submission is valid.
A 2-step validation, like cqcounter lookup form.
I can't find any examples where this is used in a cached drupal setup. Can this be done in drupal with captcha, or is holding a form submission while a second form is not validated not possible?