[tor-bugs] #20535 [Core Tor/Tor]: A 304 "Not Modified" should update the time to when we next expect a modification

[Tor Bug Tracker & Wiki]

#20535: A 304 "Not Modified" should update the time to when we next expect a
modification
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.9.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  regression
Actual Points:                |  Parent ID:
       Points:  0.5           |   Reviewer:
      Sponsor:                |
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 In #20499, we discovered that when a 304 "Not Modified" is received,
 relays try too hard when 09a0f2d0b is reverted, and don't try enough when
 it is applied.

 Instead, we should retry when we next expect the document to be modified.
 And if we don't know, we should retry on some sensible schedule.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20535>
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