diff --git a/src/facegraph/canvas.py b/src/facegraph/canvas.py
index b206626..333bdc2 100644
--- a/src/facegraph/canvas.py
+++ b/src/facegraph/canvas.py
@@ -10,12 +10,13 @@
 import signature
 
 
-def b64url_decode(encoded):
-    """Decode a string encoded in URL-safe base64 without padding."""
-    
-    # The padding should round the length of the string up to a multiple of 4.
-    padding_fixed = encoded + (((4 - (len(encoded) % 4)) % 4) * '=')
-    return base64.urlsafe_b64decode(str(padding_fixed))
+def b64url_encode(data):
+    return base64.urlsafe_b64encode(data).rstrip('=')
+        
+def b64url_decode(data):
+    data = data.encode(u'ascii')
+    data += '=' * (4 - (len(data) % 4))
+    return base64.urlsafe_b64decode(data)
 
 
 def decode_signed_request(app_secret, signed_request):
diff --git a/src/facegraph/django/middleware.py b/src/facegraph/django/middleware.py
index 170b57a..d9b5675 100644
--- a/src/facegraph/django/middleware.py
+++ b/src/facegraph/django/middleware.py
@@ -76,7 +76,7 @@ class FacebookCanvasMiddleware(object):
     
     def process_request(self, request):
         app_secret = self.app_secret(request)
-        raw_fbrequest = request.GET.get('signed_request', None)
+        raw_fbrequest = request.REQUEST.get('signed_request', None)
         if not (app_secret and raw_fbrequest):
             request.fbrequest = None
             return
diff --git a/src/facegraph/fql.py b/src/facegraph/fql.py
index b3689fb..9f751b4 100644
--- a/src/facegraph/fql.py
+++ b/src/facegraph/fql.py
@@ -107,9 +107,8 @@ def multi(self, queries, **params):
         
         return self.fetch_json(url)
     
-    @classmethod
-    def fetch_json(cls, url, data=None):
-        response = json.loads(cls.fetch(url, data=data))
+    def fetch_json(self, url, data=None):
+        response = json.loads(self.__class__.fetch(url, data=data))
         if isinstance(response, dict):
             if response.get("error_msg"):
                 code = response.get("error_code")
diff --git a/src/facegraph/graph.py b/src/facegraph/graph.py
index 3a83948..dcacf25 100644
--- a/src/facegraph/graph.py
+++ b/src/facegraph/graph.py
@@ -408,7 +408,7 @@ class Node(bunch.Bunch):
     
         def user_location(user_id):
             user = graph[user_id]()
-            if 'location' in user:
+            if 'location' in user.keys():
                 return user.location
             return False