The WebDAV support is added in the continuum build agent only for retrieving the working copies of projects.
You can use Sardine for the WebDAV client.
The first sample will retrieve the directory listing for the project with id of 1.
Sardine sardine = SardineFactory.begin(); List<DavResource> resources = sardine.getResources( "http://buildagenturl/workingcopy/1/" );
The next sample will get an InputStream reference to a remote file.
Sardine sardine = SardineFactory.begin(); InputStream is = sardine.getInputStream( "http://buildagenturl/workingcopy/1/pom.xml" );