From b626a9387900a9f717eb42765275adc0bf0875e3 Mon Sep 17 00:00:00 2001
From: Adam Dangoor <adamdangoor@gmail.com>
Date: Sun, 26 Mar 2023 14:38:11 +0100
Subject: [PATCH] Allow Response subclasses to set default_mimetype as None

This matches the type - see https://github.com/pallets/werkzeug/blob/92c6380248c7272ee668e1f8bbd80447027ccce2/src/werkzeug/sansio/response.py#L94.
---
 src/flask/wrappers.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/flask/wrappers.py b/src/flask/wrappers.py
index e36a72cb..ca2ad017 100644
--- a/src/flask/wrappers.py
+++ b/src/flask/wrappers.py
@@ -151,7 +151,7 @@ class Response(ResponseBase):
         Added :attr:`max_cookie_size`.
     """
 
-    default_mimetype = "text/html"
+    default_mimetype: t.Optional[str] = "text/html"
 
     json_module = json