108536490: add the proxy_fix

app/its_dangerous_session.py

@@ -13,14 +13,14 @@ class ItsdangerousSession(CallbackDict, SessionMixin):
 
 
 class ItsdangerousSessionInterface(SessionInterface):
-    salt = 'cookie-session'
     session_class = ItsdangerousSession
 
     def get_serializer(self, app):
+        salt = app.config.get('DANGEROUS_SALT')
         if not app.secret_key:
             return None
         return URLSafeTimedSerializer(app.secret_key,
-                                      salt=self.salt)
+                                      salt=salt)
 
     def open_session(self, app, request):
         s = self.get_serializer(app)