I created a custom maintenance page which appears after setting the **maintenance.flag** file.

The custom page has a few forms which I copied from the normal page, but they are not working.
Validation and date time picking works but If I send the form then I get `503 service unavailable` in the network analysis.

[![503][1]][1]

I need the forms so that users can contact me and order stuff while the page is down.

It works without problems on the main page if the **maintenance.flag** is not set?

How can I allow the form on maintenance mode?

EDIT: This question is obviously not a duplicate of (https://magento.stackexchange.com/questions/24389/1-9-0-1-maintenance-mode) because I don't ask how to put magento in maintenance mode. Learn english please @MagenX.

  [1]: https://i.sstatic.net/BNZOT.png