Plesk 12.5 and Ownloud 8.2.2 problem with missing authentication headers

[Thomas Poisl]

I observed the following problem quite some time ago and wonder if anyone has found a solution for it yet.

When you are running latest Plesk 12.5 (on CentOS 7.2 running nginx) with Owncloud 8.2.2 there is a problem, when you work with PHP 5.6.17 fpm served by apache:

• Owncloud webfrontend works fine, but when you are trying to use the caldav or carddav componentes (e.g. https://domain.com/owncloud/remote.php/carddav/addressbooks/user/addressbook/) you won't be able to login any will receive a "No basic authentication headers were found" error.

Workaround to this problem is simple:

• switch to fpm served by nginx, or
• fastcgi served by apache

After some reading, it seems the problem is caused by caching but anything I tried to modify in the .htaccess yet did not work.

I wonder if there is a solution to the problem for using the PHP fpm served by apache.