diff --git a/prestapyt/prestapyt.py b/prestapyt/prestapyt.py
index 96732d8..7e8a9cc 100644
--- a/prestapyt/prestapyt.py
+++ b/prestapyt/prestapyt.py
@@ -33,8 +33,7 @@
 except ImportError, e:
     from xml.etree import ElementTree
 
-requests.defaults.defaults['base_headers']['User-Agent'] = 'Prestapyt: Python Prestashop Library'
-
+requests.utils.default_user_agent('Prestapyt: Python Prestashop Library')
 
 class PrestaShopWebServiceError(Exception):
     """Generic PrestaShop WebServices error class
@@ -63,7 +62,7 @@ class PrestaShopWebService(object):
     """
 
     MIN_COMPATIBLE_VERSION = '1.4.0.17'
-    MAX_COMPATIBLE_VERSION = '1.5.4.0'
+    MAX_COMPATIBLE_VERSION = '1.6.11.0'
 
     def __init__(self, api_url, api_key, debug=False, headers=None, client_args=None):
         """
@@ -99,13 +98,18 @@ def __init__(self, api_url, api_key, debug=False, headers=None, client_args=None
 
         # optional arguments
         self.debug = debug
-        client_args.update({'auth' : (api_key, '')})
 
         # use header you coders you want, otherwise, use a default
         self.headers = {} if headers is None else headers
 
         # init http client in the init for re-use the same connection for all call
-        self.client = requests.session(**client_args)
+        self.client = requests.Session()
+        self.client.auth=(api_key, '')
+        if 'timeout' in client_args:
+            self.client.timeout=client_args['timeout']
+        if 'ca_certs' in client_args:
+            self.client.cert=client_args['ca_certs']
+        
 
     def _parse_error(self, xml_content):
         """
@@ -322,7 +326,16 @@ def add_with_url(self, url, content, img_filename=None):
                     pretty_body = content
                 print "Execute url: %s / method: POST\nbody: %s" % (url, pretty_body)
 
-            r = self._execute(url, 'POST', data=urllib.urlencode({'xml': content.encode('utf-8')}), add_headers=headers)
+            # Needed to remove the URL Encoding as the POST method was no longer working with URL Encoded data
+            # I do not think this is correct, as the payload for a POST should be ASCII data.
+            # See http://stackoverflow.com/questions/4007969/application-x-www-form-urlencoded-or-multipart-form-data/4073451#4073451
+            # for an explanation was to why POST data should be URL encoded for application/x-www-form-urlencoded
+            # submissions
+            # I presume this was working previously, and can only speculate that there has been some sort of change
+            # in the Prestashop API handling of POST methods
+            # This version works for Prestashop 1.6.11
+            
+            r = self._execute(url, 'POST', data=content.encode('utf-8'), add_headers=headers)
         else:
             img_binary = base64.decodestring(content)
             img_file = StringIO(img_binary)
@@ -483,11 +496,11 @@ def dive(response, level=1):
 
         # returned response looks like :
         # for many resources :
-        # {'addresses': {'address': [{'attrs': {'id': '1'}, 'value': ''},
-        #                            {'attrs': {'id': '2'}, 'value': ''},
-        #                            {'attrs': {'id': '3'}, 'value': ''}]}}
+        # {'addresses': {'address': [{'id': '1', 'value': ''},
+        #                            {'id': '2', 'value': ''},
+        #                            {'id': '3', 'value': ''}]}}
         # for one resource :
-        # {'addresses': {'address': {'attrs': {'id': '1'}, 'value': ''}}}
+        # {'addresses': {'address': {'id': '1', 'value': ''}}}
         # for zero resource :
         # {'addresses': ''}
         response = super(PrestaShopWebServiceDict, self).\
@@ -498,10 +511,9 @@ def dive(response, level=1):
         if not elems:
             return []
         elif isinstance(elems, list):
-            ids = [int(elem['attrs']['id']) for elem in elems]
+            return elems
         else:
-            ids = [int(elems['attrs']['id'])]
-        return ids
+            return [elems]
 
     def get(self, resource, resource_id=None, options=None):
         """