Whether and how to cache Results Authorization traffic. The default
of None does no caching. When set to Session, Results
Authorization traffic is cached for the duration of the session,
i.e. that search alone. Normally caching is of little benefit,
because authorization URLs are typically the same as result URLs, and
the latter are typically unique in a given search; thus caching will
not help. However, if the Authorization URL field is populated,
and Allow Authorization URL is enabled, enabling caching may
speed up Results Authorization searches. See Allow Authorization
URL (here) for details.