//  names start with cap are states//  names start with app:: are appliction handlers//  names start with dum:: are dum interface to application//  names start with lower case are actions//  names start with on are events//state machine for each realm encountered in a challenge//authentication headers are added in DialogUsageManager::send, but are calculated when processing challengesdigraph ClientAuthManager {//  rankdir=LR;  node [shape = box];  Invalid -> Current [ label = "401/407, create credentials" ];    Current -> Cached  [ label = ">180 && !(401 || 407)" ];  Current -> Current [ label = "401/407 stale=true or different nonce, recreate credentials" ];  Current -> TryOnce [ label = "401/407 different nonce, recreate credentials" ];   Current -> Failed  [ label = "401/407 same nonce and not stale" ];    Cached -> Current [ label = "401/407 no conditions, recreate credentials" ];  TryOnce -> Current [ label = ">180 && !(401 || 407)" ];  TryOnce -> Failed [ label = "401/407" ];}