Hotspot local server side script

I’m looking to put a form validation on a local hotspot’s splash page but would like to perform the validation using a server side script. Is this possible?

I’ve scanned the net and the forums, and I see plenty of solutions for situations in which the splash page does not reside on the gateway itself, but nothing for this particular setup.

The gateway is a stand alone hotspot with the web server, splash page, and authentication on the same RB493AH.

Any help would be greatly appreciated.

It’s not possible with RouterOS. The only server-side processing is threw variables in hotspot servlet pages. Otherwise, it just sends text to the web browser and that’s about it.