remove example pasted from django docs 🤦

label_studio/core/middleware.py

@@ -159,23 +159,6 @@ def __call__(self, request):
         return response
 
 
-class SimpleMiddleware:
-    def __init__(self, get_response):
-        self.get_response = get_response
-        # One-time configuration and initialization.
-
-    def __call__(self, request):
-        # Code to be executed for each request before
-        # the view (and later middleware) are called.
-
-        response = self.get_response(request)
-
-        # Code to be executed for each request/response after
-        # the view is called.
-
-        return response
-
-
 class XApiKeySupportMiddleware:
     """Middleware that adds support for the X-Api-Key header, by having its value supersede
     anything that's set in the Authorization header."""