I configured Apache to do Digest Auth (as opposed to Basic Auth).
SyncEvolution, however, does not seem to be able to handle that as it can't log
in:
First ERROR encountered: child process failed: error code from SyncEvolution
authorization failed (remote, status 401): PROPFIND: Neon error code 3 =
NE_AUTH, HTTP status 401: Could not authenticate to server: rejected Digest
challenge

The server complains: "Digest: client used wrong authentication scheme
`Basic'".

There seem to be patches on meego:
http://meego.gitorious.org/~gabrielschulhof/meego-middleware/gabrielschulhof-syncevolution/commit/8ded5225ecc3d518b3edbcbf92e893ff27912eef
but I don't know whether that is relevant.

The search engine of my least mistrust doesn't result anything useful for
``syncevolution  "client used wrong authentication"'' so I reported this bug.

I expected to be able to log in my HTTP DigestAuth protected area to sync via
CalDAV.