[tbb-bugs] #27848 [Applications/Tor Browser]: Cloudflare consistently displays captcha for TorBrowser 8.0.1 but not for 8.0.0

[Tor Bug Tracker & Wiki]

#27848: Cloudflare consistently displays captcha for TorBrowser 8.0.1 but not for
8.0.0
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 Reporter:  cypherpunks_reply  |          Owner:  tbb-team
     Type:  defect             |         Status:  new
 Priority:  Medium             |      Component:  Applications/Tor Browser
  Version:                     |       Severity:  Normal
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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 [https://web.archive.org/web/20180924234009/https://twitter.com/grittygrease/status/1031920907642593280
 Nick Sullivan on twitter] claims that Cloudflare detects and treats Tor
 users differently so however they're detecting that may have been broken
 by 8.0.1.

 [https://web.archive.org/web/20180924234752/https://twitter.com/grittygrease/status/1042802493619494912
 Given the recent collaboration] between Tor and Cloudflare on avoiding the
 captcha I hope it's OK to report this here.

 I don't mean to imply the problem has anything to do with this new feature
 because if you see the screenshots, neither was given the alt-svc header
 that is supposed to allow Torbrowser to access Cloudflare sites without
 the captcha.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27848>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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