Added ability go get back the origin and validity
Added ability go get back the origin and validity

`/api/cors/GetOrigin` is a wide open cross origin
call that is available if you have the CORS
module in your response stack.   This returns
the ORIGIN header and if this header is valid
to make calls to other this through this URL.

pschlump/Go-FTL,pschlump/Go-FTL,pschlump/Go-FTL,pschlump/Go-FTL,pschlump/Go-FTL