[tor-bugs] #32938 [Circumvention/Snowflake]: Have a way to test throughput of snowflake proxy

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#32938: Have a way to test throughput of snowflake proxy
-------------------------------------+-------------------------------------
     Reporter:  cohosh               |      Owner:  cohosh
         Type:  enhancement          |     Status:  assigned
     Priority:  Medium               |  Milestone:
    Component:                       |    Version:
  Circumvention/Snowflake            |   Keywords:  snowflake-webextension,
     Severity:  Normal               |  ux-team, anti-censorship-roadmap-
                                     |  october
Actual Points:                       |  Parent ID:  #31109
       Points:                       |   Reviewer:
      Sponsor:                       |
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 A common question from snowflake proxy volunteers is whether or not their
 proxy is working (see comment 11 on #31109). It would be great to have
 some kind of bandwidth test for proxy owners to see whether or not their
 proxy is reachable from a remote probe point. This might also help us find
 and diagnose problems with existing proxies.

 Some notes:
 - we can't ask the broker to assign us a specific proxy at the moment so
 this test would likely be separate from the broker (unless we add an
 entirely new feature which I'm hesitant to do)

 - we'll have to protect this service from abuse somehow, probably by rate-
 limiting. See some discussion on #31874. It would be best to engineer a
 way so that only a proxy owner can run the test on their proxy.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32938>
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