[tor-bugs] #19662 [Core Tor/Tor]: On intro failure, Tor2web should build a 3-hop path

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#19662: On intro failure, Tor2web should build a 3-hop path
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     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.???
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  030-proposed
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
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 This enables two features:
 * Tor2web compatibility with Intro Points avoiding being one-hop proxies
 (#17945)
   * In this case, failure is defined as the inability to connect to an
 intro point with REASON_TORPROTOCOL (or whatever #17945 does)
 * Tor2web compatibility with ReachableAddresses, in particular:
   * IPv6-only Tor2web talking to non-IPv6 intro points
   * In this case, failure is defined as the inability to discover a
 reachable intro point

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19662>
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