401 Error when accessing via Android client CardDAV-Sync

Hello,

I saw in my Apache logfiles that all my three Android clients enters a 
401 (unauthorized) error when they accessing via the client 
CardDAV-Sync. See below attached log entries. The first one contains the 
error. Conspicuous is that the user name determined by HTTP 
authentication is missing.

Now my question: Do you know such entries? Is it possible to avoid these 
entries? Is there any option in Horde or the client?

=> The synchronization seems to work fine!
(I'm using latest horde-git)


Thanks,
Dominik



93.231.129.227 - - [29/May/2016:22:04:02 +0200] "OPTIONS 
/site/rpc.php/addressbooks/horde-user/contacts~XK5VyHipw66t0odp4aT71ok/ 
HTTP/1.1" 401 5191 "-" "CardDAV-Sync/0.4.19 (Motorola; cm_osprey; 
Android 6.0.1; de_DE; org.dmfs.carddav.Sync/139)"
93.231.129.227 - horde-user [29/May/2016:22:04:02 +0200] "OPTIONS 
/site/rpc.php/addressbooks/horde-user/contacts~XK5VyHipw66t0odp4aT71ok/ 
HTTP/1.1" 200 1067 "-" "CardDAV-Sync/0.4.19 (Motorola; cm_osprey; 
Android 6.0.1; de_DE; org.dmfs.carddav.Sync/139)"
93.231.129.227 - horde-user [29/May/2016:22:04:02 +0200] "PROPFIND 
/site/rpc.php/addressbooks/horde-user/contacts~XK5VyHipw66t0odp4aT71ok/ 
HTTP/1.1" 207 1432 "-" "CardDAV-Sync/0.4.19 (Motorola; cm_osprey; 
Android 6.0.1; de_DE; org.dmfs.carddav.Sync/139)"
93.231.129.227 - horde-user [29/May/2016:22:04:02 +0200] "PROPFIND 
/site/rpc.php/addressbooks/horde-user/contacts~XK5VyHipw66t0odp4aT71ok/ 
HTTP/1.1" 207 5534 "-" "CardDAV-Sync/0.4.19 (Motorola; cm_osprey; 
Android 6.0.1; de_DE; org.dmfs.carddav.Sync/139)"
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