BUGFIX: mobile ui was being cached for anon views

config/initializers/99-anon-cache.rb

@@ -7,6 +7,7 @@ enabled = if Rails.configuration.respond_to?(:enable_anon_caching)
           end
 
 if !ENV['DISCOURSE_DISABLE_ANON_CACHE'] && enabled
-  Rails.configuration.middleware.insert 0, Middleware::AnonymousCache
+  # in an ideal world this is position 0, but mobile detection uses ... session and request and params
+  Rails.configuration.middleware.insert_after ActionDispatch::ParamsParser, Middleware::AnonymousCache
 end