SEND HIDDEN FIELD WITH $ _SERVER [REQUEST_URI] DOESN'T WORK

I'm taking a HIDDEN field WITH THIS DATA:

AND SENDING THROUGH THE FORM BY CHRONOFORMS BUT IT IS NOT ARRIVING IN EMAIL.
DOES ANYONE KNOW WHAT CAN IT BE?
-----------------------------------------------------------------------
PLACING IN A SIMPLE HTML AND TESTING ON THE SERVER WORKS, BUT IF SENDING THROUGH CHRONOFORMS IT DOESN'T COME.
In another version of cronoforms I was able to do that.
THANK YOU VERY MUCH IF SOMEONE CAN HELP.

​

SOLVED WITH {url: _self}

. tHANKS