[tor-bugs] #21650 [Core Tor/Tor]: prop140: Clients request diffs and handle diffs in replies

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#21650: prop140: Clients request diffs and handle diffs in replies
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     Reporter:  nickm         |      Owner:
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #13339
       Points:  4             |   Reviewer:
      Sponsor:  Sponsor4      |
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 For the final piece of prop140, clients should ask for consensus diffs as
 appropriate, and handle them if they're received.

 We may need proposal extensions here:
   * Should clients begin doing this immediately, or should there be a
 tristate where "default" means "look at the consensus"?
   * Should there be an option -- maybe for testing, maybe not -- that
 forces clients to look for directory guards that support consensus diffs?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21650>
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