Use normalized_url to prevent double counting query strings

Signed-off-by: Brian Donohue <brian@bthdonohue.com>

Author: Donohue

oauth2/__init__.py

@@ -551,9 +551,11 @@ def from_request(cls, http_method, http_url, headers=None, parameters=None,
         url_params = cls._split_url_string(param_str)
         parameters.update(url_params)
 
-        if parameters:
-            return cls(http_method, http_url, parameters)
- 
+        if parameters or param_str:
+            req = cls(http_method, http_url, parameters)
+            req.url = req.normalized_url
+            return req
+
         return None
 
     @classmethod