This should be the choice of the application to "retry" on exception, otherwise let the framework handle this in the lower part.
Better handling of response termination (alias commit)
Added the notion of "status_committed"
- added RFC1123 http date format helper
- added put_cookie_with_expiration_date as DATE_TIME
REQUEST: added `execution_variable' to provide a way to keep object attached to the request
and indexed by a string. A typical usage is a SESSION object