[tor-bugs] #29207 [Circumvention/Snowflake]: New design for broker -- proxy protocol for snowflakes

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#29207: New design for broker -- proxy protocol for snowflakes
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 Reporter:  cohosh                               |          Owner:  cohosh
     Type:  enhancement                          |         Status:
                                                 |  merge_ready
 Priority:  High                                 |      Milestone:
Component:  Circumvention/Snowflake              |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  snowflake, design, ex-sponsor-19,    |  Actual Points:  2
  anti-censorship-roadmap                        |
Parent ID:                                       |         Points:  5
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor28-must
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Comment (by cohosh):

 Now to talk about backwards compatibility and upgrading. The way this is
 written right now, it will kick out proxies that haven't updated. I think
 this is a feature, we have some performance problems right now that might
 be due to proxies that haven't updated. It also gives a means to exclude
 proxies in the future for not updating (by the `Version` field supplied in
 the polls). I tested this out using snowbox and the broker handles new as
 well as outdated requests just fine, and it returns a `400 Bad Request`
 for outdated proxies. What I could see desirable here is a way for the
 proxy to disable itself if it receives a `4XX` status code.

 We also currently have two brokers, one on the new migrated host and one
 on the old host due to #29258. I guess the best method is to deploy it at
 both hosts simultaneously.

 Anyone opposed to me starting this deployment? I plan to update the
 brokers first and then quickly do a proxy update.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29207#comment:29>
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