WebDAV: Requirements, Configurations?

1

What are the prerequisites for Ganttproject to be able to work with the “Project → Webserver → Open from the net …” or “Save to the net”?

We use WebDAV with Apache2 with “mod_dav”, “mod_fs”, “mod_lock” .

As configuration we use:

CustomLog /var/log/apache2/webdav.log vhost_combined
ErrorLog /var/log/apache2/webdav.err.log
LogLevel info
DavLockDB /srv/www/DavLock/DavLock.db
Alias /webdav "/srv/www/webdav"
<Location /webdav>
    DAV on
    Options +Indexes
    AuthType Basic
    AuthName webdav
    AuthUserFile  /etc/apache2/users.password
    Require valid-user
</Location>

Read and write works.
A lock (LOCK) of files does not work with Ganttproject.
Locking files with the client “DAVExplorer”, however, already works.

The “litmus”-Test (litmus - WebDAV server protocol compliance test suite) says:

→ running basic': ... summary for basic’: of 16 tests run: 16 passed, 0 failed. 100.0%
→ running copymove': ... summary for copymove’: of 13 tests run: 13 passed, 0 failed. 100.0%
→ running props': ... summary for props’: of 30 tests run: 30 passed, 0 failed. 100.0%
→ running locks': ... 18. cond_put_corrupt_token WARNING: PUT failed with 400 not 423 ...................... pass (with 1 warning) ... 38. unmapped_lock......... WARNING: LOCK on unmapped url returned 200 not 201 (RFC4918:S7.3) ...................... pass (with 1 warning) ... summary for locks’: of 41 tests run: 41 passed, 0 failed. 100.0%
→ 2 warnings were issued.
→ running http': ... summary for http’: of 4 tests run: 4 passed, 0 failed. 100.0%

Are there any special requirements for Ganttproject here regarding WebDAV?