Good point, except that the "sessions" in this case are not necessarily tied to "user sessions" - a new session id would be generated for each search, and embedded in the URLs to retrieve the data (I would never store these "session" ids as cookies). In fact this also allows people to share the search sessions, simply by exchanging the formatted URLs.
Would Cache::Cache offer any additional advantages with this scenario? The way I see it, CGI::Session will also generate the ids for me (and I can use the same mechanism for storing actual user sessions, should I need them).
(Incidentally, a few popular systems use this concept of "session" as different from an HTTP session - Lion's SRS comes to mind; so my users are quite used to the idea).
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