CachePasswords is
enabled. %0 is replace by the current username which is
also the default key when CachePasswordKey is not
set.# %0 expands to the current username which is the
# hardcoded default when CachePasswordKey is not set.
CachePasswordKey %0
# Use current username and an attribute from $p (current request)
CachePasswordKey %0:%{X-Device-Group}