Local Handler macros
Some macros are specific to 1 virtual host but stored in the session even if the user does not walk over this vhost. Proposition :
- remember datas key count before rules evaluation
- some rules (or headers) contains "$a ||= "
- if key count has changed, store updates in local cache
So session will stay unchanged, but local complex rules will be calculated only 1 time each 10 minutes max.