[Akonadi] [Bug 344874] username/password not being sent in header

[Olaf Titz via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=344874

--- Comment #9 from Olaf Titz <olaf at bigred.inka.de> ---
There is a recurring issue in support fora related to owncloud and iOS/Android
CalDAV sync apps. I still don't understand it completely, but it seems to be
related to two or three potential reasons. All of them have to do with the fact
that PROPFIND is treated differently from GET (at least by Apache).
1. Sure: a number of misconfigurations of Apache can cause Apache and/or
Owncloud to misunderstand the initial PROPFIND request. There is plenty of
documentation about that. (Everything here applies not to owncloud exclusively
but to all Apache/PHP-based DAV services.)
2. Confirmed: When the requested resource is not known (wrong URL), Apache
responds 405 instead of 404 to PROPFIND, so the end user gets a misleading
technical error message instead of a plain "URL not found".
3. Speculative: it looks like Apache responds 405 instead of 401 too in certain
circumstances, but I'm not exactly sure what causes this. This is what really
can cause breakage to the authorization protocol.

The DAVdroid app has an option to always send an Authorization header with the
first request to work around these kind of problems (at least the #3 one) and
the recommendation could be that Akonadi get such an option too.

(Now I don't have the problem any more since I fixed my setup on all three
sides (owncloud, android, akonadi) but getting it right everywhere was much
harder than it should be...)

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