From 7f3a69b7a575b3b80e45fc902457416359e0e837 Mon Sep 17 00:00:00 2001
From: Mike Lee <96452814+MikeLeePoly@users.noreply.github.com>
Date: Wed, 6 Sep 2023 00:50:47 +1000
Subject: [PATCH] Fix memory leak when comparing requests (#6764)

---
 moto/core/responses_custom_registry.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/moto/core/responses_custom_registry.py b/moto/core/responses_custom_registry.py
index f21a8bda4..b4642e852 100644
--- a/moto/core/responses_custom_registry.py
+++ b/moto/core/responses_custom_registry.py
@@ -26,9 +26,11 @@ class CustomRegistry(responses.registries.FirstMatchRegistry):
         self._registered.clear()
 
     def find(self, request: Any) -> Tuple[Optional[responses.BaseResponse], List[str]]:
-        all_possibles = responses._default_mock._registry.registered
         # We don't have to search through all possible methods - only the ones registered for this particular method
-        all_possibles.extend(self._registered[request.method])
+        all_possibles = (
+            responses._default_mock._registry.registered
+            + self._registered[request.method]
+        )
         found = []
         match_failed_reasons = []
         for response in all_possibles: