Is it possible to forward username to ACNS?

[staticddt]

We are trying to deploy the following topology:

[client] - [Appliance] - [ACNS] - [Web]

Our appliance is capable of forwarding an authenticated user-name via a customable http header.

Is there a way to make ACNS parse this header?

thanks

[ebreniz]

When a user requests restricted services, TACACS+ encrypts the user password information using the MD5 encryption algorithm and adds a TACACS+ packet header. This header information identifies the packet type being sent (for example, an authentication packet), the packet sequence number, the encryption type used, and the total packet length. The TACACS+ protocol then forwards the packet to the TACACS+ server.

http://www.cisco.com/en/US/products/sw/conntsw/ps491/products_configuration_guide_chapter09186a00801cc94c.html