[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:                            |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by gk):

 Replying to [comment:11 alecmuffett]:
 > Trying to wrap this essay up into a sentence:
 >
 > > Putting {{{Tor/1}}} or similar into the User-Agent will enable site
 owners to get clients to the proper onion, to the onion they want to serve
 the user through, via the means they are best equipped to serve the client
 - direct connection, alt-svc - with a minimum of cost, technical debt,
 state-maintenance or fuss.

 Yeah, I get the idea of signalling a server onion capabilities, say, by
 using a UA. I am not opposed to that. What I am not convinced of yet is
 why this needs to get included into _every_ request, e.g. for fetching an
 image on a website. Why should the user agent do that if the server it
 talked to did not react to the onion capability information in the *very
 first request*. Should it hope that while all the other resources are
 loaded over the "regular" Internet that particular image is loaded over
 .onion? It seems to me the user agent could sent this header with the
 first request and if the server does not want to react to that, that's
 cool, but then the header could get omitted as it seems the content
 provider does not want to act on that .onion offer.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32256#comment:12>
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