Gluster users - Dec 2010 - How to enable WebDAV/HTTP/FTP access and the REST/XML API?

Gluster supports client access with a native client, cifs and nfs and,
according to this document
http://www.raidinc.com/pdf/whitepapers/wp-gluster-vm-environments.pdf,
WebDAV, HTTP and FTP. How can I enable the at last mentioned features?

Furthermore I am interested in how to access the advertised REST Api? In
the documentation there is not even one result when searching and I get
the impression there is no API :)

EM