pithos-api: Update api_method wrapper

snf-pithos-app/pithos/api/util.py

@@ -1062,13 +1062,14 @@ def get_pithos_usage(token):
 
 
 def api_method(http_method=None, token_required=True, user_required=True, logger=None,
-               format_allowed=False, default_serialization="json"):
+               format_allowed=False, serializations=None):
+    serializations = serializations or ['json', 'xml']
     def decorator(func):
         @api.api_method(http_method=http_method, token_required=token_required,
                         user_required=user_required,
                         logger=logger, format_allowed=format_allowed,
                         astakos_url=ASTAKOS_BASE_URL,
-                        default_serialization=default_serialization)
+                        serializations=serializations)
         @wraps(func)
         def wrapper(request, *args, **kwargs):
             # The args variable may contain up to (account, container, object).