[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 alecmuffett):

 Aside: I think you answered your own question when you said:

 >the user agent could sent this header with the first request

 ...because that word "first" means state-maintenance; as with the "link
 onion-enabling stuff with the first dropping of a session cookie" model,
 there are three issues:

 - not all sites want to use cookies / track their users; what then, re:
 state-tracking?

 - by linking the onion-enablement to "first drop", there is no opportunity
 to revisit or "nudge" the user towards onion

 and thirdly

 - by eliding the six bytes of {{{Tor/1}}} from the header, you make it
 somewhat harder for people to implement stuff like:

 '''You are not Onion-Capable! We recommend that you run TorBrowser for
 access to this site! '''

 ...which is potentially desirable for brand awareness :-)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32256#comment:14>
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