NGINX as some sort of token server.

Hi guys,

I'm wondering if there is any way to configure nginx to be some sort of token server for some urls.
Let me give you an example. There are number of requests to the url like post.php. Some of them are actually spam requests and abuses. Is there any way to do something like when the user accesses post.php nginx displays a "token site" which basically says "Please click here to continue". Based on the click it forwards you to the desired destination.

Thank you for your help!