2.2.12 X-Forms_Based_Auth_Required Header
This protocol uses the X-Forms_Based_Auth_Required header for handling requests that have not been previously authenticated.
This header is defined in ABNF syntax as follows.
-
x-forms_based_auth_required-header = "X-Forms_Based_Auth_Required" ":" x-forms_based_auth_required-value x-forms_based_auth_required-value = 1*TEXT
The x-forms_based_auth_required-value element is the URL of a form authentication logon page.