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It loads from the disk cache if the pages are there (NSURLRequestReturnCacheDataElseLoad).

Some items are not allowed in the disk cache (NSURLCacheStorageAllowedInMemoryOnly or NSURLCacheStorageNotAllowed) while others may have been flushed by browsing in other workspaces or submitting forms.

We have considered storing webarchives of the current page--but there are lots of issues to consider (https security for example).