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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.