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1b1ed1a
(Get the code!)
(In reply to comment #20)
> I'm thinking that this could be the same as bug 390036 and bug 428522.
>
> I'm not sure that Lightning 0.8 is causing the problem. As I reported in one
> of those bugs, Lightning 0.7 can also show this behavior.
>
Interesting. Maxime's original report of this bug did coincide rather precisely with a major change to the CalDAV provider that caused increased startup loads, but I suppose that could be a red herring. Since at least one and I think probably both of the bugs Pete cites involved ICS calendars, not CalDAV, I have to wonder if the patch proposed in bug 416239 would make a difference: if so that would point a finger at the webdav extension. Good to know even if we don't decide to accept that patch.
The error cited in the bug description here is caused by the CalDAV provider trying to fish the WWW-Authenticate header out of the reponse to a PROPFIND request, and failing. That header kind of really ought to be there at that point, and we've had other reports of odd things happening wrt authentication with DAViCal (bug 423767, bug 428034) so it's possible this is a DAViCal issue rather than a Mozilla one. It would be helpful if someone could wireshark the interaction leading up to this error.