From 6cc92bc055a2464141a64df098cec8f26c2f0240 Mon Sep 17 00:00:00 2001
From: nightcityblade <nightcityblade@gmail.com>
Date: Fri, 3 Jul 2026 11:26:42 +0800
Subject: [PATCH] Fix _transport_sockname request initialization warning

---
 CHANGES/13029.bugfix.rst  |  3 +++
 aiohttp/web_request.py    |  1 +
 tests/test_web_request.py | 23 +++++++++++++++++++++++
 3 files changed, 27 insertions(+)
 create mode 100644 CHANGES/13029.bugfix.rst

diff --git a/CHANGES/13029.bugfix.rst b/CHANGES/13029.bugfix.rst
new file mode 100644
index 00000000000..629b723deba
--- /dev/null
+++ b/CHANGES/13029.bugfix.rst
@@ -0,0 +1,3 @@
+Fixed a deprecation warning during request initialization by allowing
+``BaseRequest`` to assign ``_transport_sockname``.
+-- by :user:`nightcityblade`.
diff --git a/aiohttp/web_request.py b/aiohttp/web_request.py
index d3d9cc2989f..ca925e2acdb 100644
--- a/aiohttp/web_request.py
+++ b/aiohttp/web_request.py
@@ -132,6 +132,7 @@ class BaseRequest(MutableMapping[str | RequestKey[Any], Any], HeadersMixin):
             "_loop",
             "_transport_sslcontext",
             "_transport_peername",
+            "_transport_sockname",
         ]
     )
     _post: MultiDictProxy[_Post] | None = None
diff --git a/tests/test_web_request.py b/tests/test_web_request.py
index d025c8c4812..4815fc073c7 100644
--- a/tests/test_web_request.py
+++ b/tests/test_web_request.py
@@ -167,6 +167,29 @@ def test_host_with_no_transport_sockname() -> None:
     assert req.host == ""
 
 
+def test_request_init_allows_transport_sockname_assignment() -> None:
+    message = make_mocked_request("GET", "/")._message
+    payload = mock.Mock()
+    payload_writer = mock.Mock()
+    task = mock.Mock()
+    loop = mock.Mock()
+    protocol = mock.Mock()
+    protocol.ssl_context = None
+    protocol.peername = None
+    protocol.sockname = ("127.0.0.1", 8080)
+
+    req = BaseRequest(
+        message,
+        payload,
+        protocol,
+        payload_writer,
+        task,
+        loop,
+    )
+
+    assert req._transport_sockname == ("127.0.0.1", 8080)
+
+
 def test_doubleslashes() -> None:
     # NB: //foo/bar is an absolute URL with foo netloc and /bar path
     req = make_mocked_request("GET", "/bar//foo/")