Check Authorization / WWW-Authenticate headers

Erich,

in your irule, replace the code:

set basicuserid [string tolower [getfield [b64decode [lindex [HTTP::header Authorization] 1]] ":" 1]]

with:

if {[catch {set basicuserid [HTTP::username] }]} { set basicuserid ""}

It does the same thing but with the F5 header.