From 6b18cd11ca6c38e2e43fbb71450ec5bdc6b321b6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=A9=EC=84=B1=EB=B2=94=20=28Bang=20Seongbeom=29?=
 <bangseongbeom@gmail.com>
Date: Sat, 18 Apr 2026 02:06:41 +0900
Subject: [PATCH] Refactor WSGIEnvironment to use TypedDict

---
 Lib/wsgiref/types.py | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/Lib/wsgiref/types.py b/Lib/wsgiref/types.py
index ef0aead5b28b64..67894da933d49c 100644
--- a/Lib/wsgiref/types.py
+++ b/Lib/wsgiref/types.py
@@ -2,7 +2,7 @@
 
 from collections.abc import Callable, Iterable, Iterator
 from types import TracebackType
-from typing import Any, Protocol, TypeAlias
+from typing import Any, Literal, NotRequired, Protocol, TypeAlias, TypedDict
 
 __all__ = [
     "StartResponse",
@@ -26,7 +26,29 @@ def __call__(
         /,
     ) -> Callable[[bytes], object]: ...
 
-WSGIEnvironment: TypeAlias = dict[str, Any]
+WSGIEnvironment = TypedDict(
+    "WSGIEnvironment",
+    {
+        "REQUEST_METHOD": str,
+        "SCRIPT_NAME": NotRequired[str],
+        "PATH_INFO": NotRequired[str],
+        "QUERY_STRING": NotRequired[str],
+        "CONTENT_TYPE": NotRequired[str],
+        "CONTENT_LENGTH": NotRequired[str],
+        "SERVER_NAME": str,
+        "SERVER_PORT": str,
+        "SERVER_PROTOCOL": str,
+        "wsgi.version": tuple[Literal[1], Literal[0]],
+        "wsgi.url_scheme": str,
+        "wsgi.input": "InputStream",
+        "wsgi.errors": "ErrorStream",
+        "wsgi.multithread": Any,
+        "wsgi.multiprocess": Any,
+        "wsgi.run_once": Any,
+        "wsgi.file_wrapper": NotRequired["FileWrapper"],
+    },
+    extra_items=Any,
+)
 WSGIApplication: TypeAlias = Callable[[WSGIEnvironment, StartResponse],
     Iterable[bytes]]