From d84be65b79e0e8c275d503ab66605f4bcf29523f Mon Sep 17 00:00:00 2001
From: pin <7534292+pintaste@users.noreply.github.com>
Date: Wed, 20 May 2026 06:08:03 +0800
Subject: [PATCH] fix: catch ImportError for optional ujson/orjson imports

ModuleNotFoundError is a subclass of ImportError, but some environments
raise ImportError directly when optional dependencies are not installed.
Catching ImportError covers both cases.

Fixes #15536
---
 fastapi/responses.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fastapi/responses.py b/fastapi/responses.py
index 29df4b7a61..0c9caa4d04 100644
--- a/fastapi/responses.py
+++ b/fastapi/responses.py
@@ -26,13 +26,13 @@ class _OrjsonModule(Protocol):
 
 try:
     ujson = cast(_UjsonModule, importlib.import_module("ujson"))
-except ModuleNotFoundError:  # pragma: nocover
+except ImportError:  # pragma: nocover
     ujson = None  # type: ignore[assignment]
 
 
 try:
     orjson = cast(_OrjsonModule, importlib.import_module("orjson"))
-except ModuleNotFoundError:  # pragma: nocover
+except ImportError:  # pragma: nocover
     orjson = None  # type: ignore[assignment]