[Bug 32125] Should support auth using captcha

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32125

--- Comment #6 from Simon McVittie <simon.mcvittie at collabora.co.uk> 2012-01-25 11:57:16 UTC ---
Regarding error conditions, in XMPP we have:

- if client gives up or doesn't understand, it sends <not-acceptable/>
  (so in XMPP, User_Cancelled and Not_Supported would both map to
  the same thing - but in other protocols they might be different)

- if client gives the wrong answer, server sends <not-acceptable/>,
  which could map to AuthenticationFailed (stretching the meaning of
  "authentication" a bit)

- if client replies much too slowly, or twice, or otherwise gets the
  protocol wrong, the server sends <service-unavailable/>, which
  could map to NotAvailable

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