[6.1] document_webdav "500 internal server error" with pywebdav 0.9.8

[Dimitris Lampridis]

- Debian Wheezy on amd64 with Python 2.7 and PyWebDav 0.9.8 (debian package python-webdav 0.9.8-3)
- OCB 6.1
- Server revno: 4328
- addons revno: 6847
- web revno: 2523

After enabling the crm_caldav and document_webdav modules, I try to access any webdav folder and I get an "500 Internal Server Error" message.

The log shows:

2014-09-23 08:56:44,837 29663 WARNING ? webdav: Cannot calculate own address: '_fileobject' object has no attribute 'getsockname'
2014-09-23 08:56:44,852 29663 INFO ? werkzeug: 192.168.1.68 - - [23/Sep/2014 08:56:44] "GET /webdav/llerbdb/Documents HTTP/1.1" 500 -
2014-09-23 08:56:44,855 29663 ERROR ? werkzeug: Error on request:
Traceback (most recent call last):
  File "/usr/share/pyshared/werkzeug/serving.py", line 159, in run_wsgi
    execute(app)
  File "/usr/share/pyshared/werkzeug/serving.py", line 146, in execute
    application_iter = app(environ, start_response)
  File "/mnt/lldata/openerp/ocb-6.1/ocb-server/openerp/wsgi/core.py", line 413, in application
    result = handler(environ, start_response)
  File "/mnt/lldata/openerp/ocb-6.1/ocb-server/openerp/wsgi/core.py", line 255, in wsgi_webdav
    return http_to_wsgi(http_dir)(environ, start_response)
  File "/mnt/lldata/openerp/ocb-6.1/ocb-server/openerp/wsgi/core.py", line 309, in wsgi_handler
    handler = http_dir.instanciate_handler(con, environ['REMOTE_ADDR'], server)
  File "/mnt/lldata/openerp/ocb-6.1/ocb-server/openerp/service/websrv_lib.py", line 104, in instanciate_handler
    handler = self.handler(noconnection(request), client_address, server)
  File "/usr/lib/python2.7/SocketServer.py", line 649, in __init__
    self.handle()
  File "/mnt/lldata/openerp/ocb-6.1/ocb-addons/document_webdav/webdav_server.py", line 97, in handle
    self._init_buffer()
AttributeError: DAVHandler instance has no attribute '_init_buffer'

I tried the same with the official OpenERP 6.1, where I cannot even install the "crm_caldav" module, I get a warning that pywebdav (>=0.94) is not installed. I guess I'm hitting this bug (which does not apply to OCB?):

https://bugs.launchpad.net/openobject-addons/+bug/1008513

Apologies if the above information is incomplete, I'm new to OpenERP and OCB in particular. Please let me know if I can provide more information.

Thank you,
Dimitris