Apache auth_digest error with ownCloud app when folders other than /var/www/owncloud have AuthType Digest

Steps to reproduce

  1. Have AuthType Digest enabled for /var/www in 000-default-le-ssl.conf
  2. Have AuthType None enabled for /var/www/owncloud in 000-default-le-ssl.conf
  3. Restart apache2 service
  4. Log onto ownCloud from web browser and use the ownCloud functionality
  5. Log onto ownCloud from Android app and use the ownCloud functionality

Expected behaviour

Both ownCloud web browser interface and ownCloud Android app work as designed, while non-ownCloud content on the web server is protect with Apache Digest Authentication

Actual behaviour

  1. ownCloud web browser interface works fine
  2. Non-ownCloud content on the web server is protected by Apache Digest Authentication
  3. ownCloud Android App: logging in is possible, but synchronisation leads to Apache auth_digest errors:
    AH17081: client used wrong authentication scheme ‘Basic’: /cloud/capabilities
    AH17081: client used wrong authentication scheme ‘Basic’: /cloud/user
    AH17081: client used wrong authentication scheme ‘Basic’: /dav/files/
    AH17081: client used wrong authentication scheme ‘Basic’: /avatar/
    AH17081: client used wrong authentication scheme ‘Basic’: /dav/files/

Server configuration

Operating system:
Raspbian GNU/Linux 10 (buster)
Web server:
Apache/2.4.38 (Raspbian)
Database:
Ver 15.1 Distrib 10.3.17-MariaDB, for debian-linux-gnueabihf (armv7l) using readline 5.2
PHP version:
PHP 7.2.9-1+b2 (cli)
ownCloud version: (see ownCloud admin page)
10.3.2.2
Updated from an older ownCloud or fresh install:
Fresh install
Where did you install ownCloud from:
Download section of official ownCloud website
Signing status (ownCloud 9.0 and above):
No errors have been found.
The content of the ownCloud configuration report:
https://gist.github.com/sjoerdj/d7fd15fd04aa4d8c62d917c55d4c4cd8#file-config_report_20200126-json
The content of /etc/apache2/sites-available/000-default-le-ssl.conf:
https://gist.github.com/sjoerdj/e6e267b674e16117dd7cca6b81ef13e8#file-000-default-le-ssl-conf
List of activated apps:
comments: 0.3.0
configreport: 0.2.0
dav: 0.5.0
encryption: 1.4.0
federatedfilesharing: 0.5.0
federation: 0.1.0
files: 1.5.2
files_external: 0.7.1
files_mediaviewer: 1.0.1
files_pdfviewer: 0.11.1
files_sharing: 0.12.0
files_trashbin: 0.9.1
files_versions: 1.3.0
firstrunwizard: 1.2.0
market: 0.5.0
notifications: 0.5.0
provisioning_api: 0.5.0
systemtags: 0.3.0
updatenotification: 0.2.1
Are you using external storage, if yes which one: local/smb/sftp/…
No
Are you using encryption: yes/no
Yes (master key)
Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/…
No

Client configuration

Browser:
Google Chrome version 79.0.3945.88 (Official build) (64-bits)
Operating system:
Windows 10 Pro version 1903

Logs

Web server error log:
[Sun Jan 26 09:49:46.055467 2020] [auth_digest:error] [pid 18351] [client x.x.x.x] AH17081: client used wrong authentication scheme ‘Basic’: /cloud/capabilities
[Sun Jan 26 09:49:47.887529 2020] [auth_digest:error] [pid 18351] [client x.x.x.x] AH17081: client used wrong authentication scheme ‘Basic’: /cloud/user
[Sun Jan 26 09:49:49.343337 2020] [auth_digest:error] [pid 18351] [client x.x.x.x] AH17081: client used wrong authentication scheme ‘Basic’: /dav/files/username
[Sun Jan 26 09:49:50.736224 2020] [auth_digest:error] [pid 18351] [client x.x.x.x] AH17081: client used wrong authentication scheme ‘Basic’: /avatar/username
[Sun Jan 26 09:49:53.779895 2020] [auth_digest:error] [pid 18361] [client x.x.x.x] AH17081: client used wrong authentication scheme ‘Basic’: /dav/files/username
ownCloud log (data/owncloud.log):
Not inserted, as there are no lines in this log related to the issue
Browser log:
Not inserted, as browser functionality is fine (issue occurs with using Android App)