[rt-users] How to access X-RT-Interface header from On Create scrip?

[Russell Jones]

I am trying to access the new X-RT-Interface header in order to 
determine within a Scrip if a ticket was created via Email or Web. 
However whenever I try to create a new ticket and use an On Create scrip 
to read this header, I get errors saying "Can't call method "GetHeader" 
on an undefined value".

Can anyone please provide an example of how to properly access this header?
Thank you!