I sniffed my network and the User-Agent is “LibreOffice” and the protocol is DAV. Here is what I get to sustain that:
PROPFIND /persona/491813 HTTP/1.1
Keep-Alive:
Connection: TE, Keep-Alive
TE: trailers
Host: www.getpersonas.com
Depth: 0
Content-Length: 237
Content-Type: application/xml
Pragma: no-cache
User-Agent: LibreOffice
and
<?xml version="1.0" encoding="utf-8"?>
<propfind xmlns="DAV:"><prop>
<resourcetype xmlns="DAV:"/>
<IsReadOnly xmlns="http://ucb.openoffice.org/dav/props/"/>
<getcontenttype xmlns="DAV:"/>
<supportedlock xmlns="DAV:"/>
</prop></propfind>