I am trying to install webdav, I've installed document_Webdav module and PyWebDav package, I have added the following to openerp-server.conf:

 [webdav]
enable = True
vdir = webdav
verbose = True
debug = True

but I get empty responce in some webdav clients, in the others I get http error 500. I have checked the log and there is something like this:

2014-07-21 13:26:47,766 13260 INFO ? openerp.service.http_server: Found user="admin", passwd="***" for db="test"
2014-07-21 13:26:47,823 13260 INFO Benizparts werkzeug: 127.0.0.1 - - [21/Jul/2014 13:26:47] "GET /webdav/test/Documents/ HTTP/1.1" 500 -

Is there any documents about installing webdav or did I make a mistake?