From: rijenkii <me@rijenkii.tk>
Date: Tue, 10 Feb 2026 10:52:24 +0000 (+0700)
Subject: ✨ Replace `dict` by `Mapping` on `HTTPException.headers` (#12997)
X-Git-Tag: 0.128.7~14
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=66dc695071d8a040db72d5546eb848a58b41152e;p=thirdparty%2Ffastapi%2Ffastapi.git

✨ Replace `dict` by `Mapping` on `HTTPException.headers` (#12997)

Co-authored-by: Alejandra <90076947+alejsdev@users.noreply.github.com>
Co-authored-by: Motov Yurii <109919500+YuriiMotov@users.noreply.github.com>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
---

diff --git a/fastapi/exceptions.py b/fastapi/exceptions.py
index 62b4674de..9924d0e2b 100644
--- a/fastapi/exceptions.py
+++ b/fastapi/exceptions.py
@@ -1,4 +1,4 @@
-from collections.abc import Sequence
+from collections.abc import Mapping, Sequence
 from typing import Annotated, Any, Optional, TypedDict, Union
 
 from annotated_doc import Doc
@@ -68,7 +68,7 @@ class HTTPException(StarletteHTTPException):
             ),
         ] = None,
         headers: Annotated[
-            Optional[dict[str, str]],
+            Optional[Mapping[str, str]],
             Doc(
                 """
                 Any headers to send to the client in the response.