[tor-bugs] #32256 [Applications/Tor Browser]: TorBrowser should advertise Onion Networking capability in the User-Agent: string

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#32256: TorBrowser should advertise Onion Networking capability in the User-Agent:
string
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 Reporter:  alecmuffett               |          Owner:  tbb-team
     Type:  enhancement               |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  TorBrowserTeam202001      |  Actual Points:
Parent ID:  #30024                    |         Points:
 Reviewer:                            |        Sponsor:  Sponsor27-can
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Comment (by cypherpunks):

 Replying to [comment:6 alecmuffett]:
 > Note for anyone saying that (eg) "to preserve privacy, Facebook should
 simply offer {{{Alt-Svc:}}} (or {{{Onion-Location:}}}) headers on all its
 requests", some basic math:
 >
 > {{{
 > strlen("Alt-Svc:
 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.onion\r\n") = 73
 >
 > Facebook does more than 1 trillion requests per day.
 >
 > 73 trillion bytes in terabits => 584 terabits
 > }}}
 >
 > Are they willing to sacrifice the environmental and energy and monetary
 costs of causing 584 terabits of global daily traffic, on Facebook alone,
 for the potential sake of one or two million users (ie: about 0.1% of the
 Facebook userbase)
 >
 > Frankly, I can't see that being justifiable in any way, when instead
 TorBrowser could just identify itself and let Facebook [and everyone else
 - BBC? NYT? Other social networks?] selectively offer {{{Alt-Svc}}}
 instead.
 >
 > https://twitter.com/AlecMuffett/status/1187338978221006848
 your math example wrong?

 {{{
 alt-svc:
 h2="facebook2b5efqy23fbcbpzs5xkfqfuwjc3csaqqvkggj3pkwkb25aid.onion:443";
 ma=86400\r\n
 }}}
  I count 93  Bytes in total on live website for this **useful** header.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32256#comment:19>
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