[tor-bugs] #12849 [Tor Sysadmin Team]: Add web cache to Onionoo's setup

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#12849: Add web cache to Onionoo's setup
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 Reporter:  karsten            |          Owner:
     Type:  task               |         Status:  new
 Priority:  normal             |      Milestone:
Component:  Tor Sysadmin Team  |        Version:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
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 The Onionoo service has become much more
 [https://people.torproject.org/~karsten/volatile/onionoo-requests.png
 "popular"] since Orbot started asking Onionoo for relay details a few
 weeks ago.  As of today, Onionoo serves around
 [https://trac.torproject.org/projects/tor/ticket/12655#comment:2 160,000
 requests per hour] to Orbot users.  These requests are for roughly 1,000
 different documents that are less than 4KB in size and updated once per
 hour.  Up to 159,000 of these requests could be served by a cache.

 Would it be possible to add something like Squid in front of Apache, or
 can we add some other caching mechanism to Apache so that it answers
 certain requests itself rather than forwarding them to Tomcat?

 Is it possible to control this cache by making Tomcat add certain headers
 to its responses, like a suggested cache lifetime?  The Tomcat application
 knows pretty well when a response is unlikely to change for 15 minutes and
 when it would be better to invalidate the cache entry after 5 minutes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12849>
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