diff --git a/easywebdav/client.py b/easywebdav/client.py
index 4003198..d3529ac 100644
--- a/easywebdav/client.py
+++ b/easywebdav/client.py
@@ -35,13 +35,22 @@ def prop(elem, name, default=None):
 
 
 def elem2file(elem):
-    return File(
-        prop(elem, 'href'),
-        int(prop(elem, 'getcontentlength', 0)),
-        prop(elem, 'getlastmodified', ''),
-        prop(elem, 'creationdate', ''),
-        prop(elem, 'getcontenttype', ''),
-    )
+    try:
+        return File(
+            prop(elem, 'href'),
+            int(prop(elem, 'getcontentlength', 0)),
+            prop(elem, 'getlastmodified', ''),
+            prop(elem, 'creationdate', ''),
+            prop(elem, 'getcontenttype', ''),
+        )
+    except:
+        return File(
+            prop(elem, 'href'),
+            0,
+            prop(elem, 'getlastmodified', ''),
+            prop(elem, 'creationdate', ''),
+            prop(elem, 'getcontenttype', ''),
+        )
 
 
 class OperationFailed(WebdavException):
@@ -150,7 +159,7 @@ def delete(self, path):
         self._send('DELETE', path, 204)
 
     def upload(self, local_path_or_fileobj, remote_path):
-        if isinstance(local_path_or_fileobj, basestring):
+        if isinstance(local_path_or_fileobj, str):
             with open(local_path_or_fileobj, 'rb') as f:
                 self._upload(f, remote_path)
         else:
@@ -161,12 +170,21 @@ def _upload(self, fileobj, remote_path):
 
     def download(self, remote_path, local_path_or_fileobj):
         response = self._send('GET', remote_path, 200, stream=True)
-        if isinstance(local_path_or_fileobj, basestring):
+        if isinstance(local_path_or_fileobj, str):
             with open(local_path_or_fileobj, 'wb') as f:
                 self._download(f, response)
         else:
             self._download(local_path_or_fileobj, response)
 
+    def tree(self, remote_path='.'):
+        response = self._send('PROPFIND', remote_path, (207, 301))
+        # Redirect
+        if response.status_code == 301:
+            url = urlparse(response.headers['location'])
+            return self.ls(url.path)
+        tree = xml.fromstring(response.content)
+        return [elem2file(elem) for elem in tree.findall('{DAV:}response')]
+
     def _download(self, fileobj, response):
         for chunk in response.iter_content(DOWNLOAD_CHUNK_SIZE_BYTES):
             fileobj.write(chunk)