There is no way to disable all SiteMinder HTTP Headers. Some of them are absolutely required in order to complete a transaction.
The following headers are the one you can disable:
- Authentication source variables: SM_AUTHDIRNAME, SM_AUTHDIRSERVER, SM_AUTHDIRNAMESPACE, SM_AUTHDIROID
- User Session variables: SM_SERVERSESSIONID, SM_SERVERSESSIONSPEC, SM_SERVERIDENTITYSPEC,SM_SESSIONDRIFT, SM_TIMETOEXPIRE
- User Name variables: SM_USER, SM_USERDN, SM_DOMINOCN