fixed debugtool middleware be after GZip middleware (#12443)

Fix django-debug-toolbar middleware be after GZip middleware

settings.py

@@ -19,7 +19,20 @@ INSTALLED_APPS += (
     'debug_toolbar',
 )
 
-MIDDLEWARE = ('debug_toolbar.middleware.DebugToolbarMiddleware',) + MIDDLEWARE
+# django-debug-doolbar middleware needs to be inserted as high as possible
+# but after GZip middleware
+def insert_debug_toolbar_middleware(middlewares):
+    ret_middleware = list(middlewares)
+
+    for i, middleware in enumerate(ret_middleware):
+        if 'GZipMiddleware' in middleware:
+            ret_middleware.insert(
+                i + 1, 'debug_toolbar.middleware.DebugToolbarMiddleware')
+            break
+
+    return tuple(ret_middleware)
+
+MIDDLEWARE = insert_debug_toolbar_middleware(MIDDLEWARE)
 
 DEBUG_TOOLBAR_CONFIG = {
     # Enable django-debug-toolbar locally, if DEBUG is True.