smithy-http: disable redirects in aiohttp client

packages/smithy-http/.changes/next-release/smithy-http-enhancement-aa179eb92d72443d8a7664d7a1a07a38.json

@@ -0,0 +1,4 @@
+{
+  "type": "enhancement",
+  "description": "Disabled automatic redirects in `AIOHTTPClient` so that redirect responses are returned to the caller instead of being followed transparently."
+}

packages/smithy-http/src/smithy_http/aio/aiohttp.py

@@ -108,6 +108,7 @@ async def send(
             params=parse_qs(request.destination.query),  # type: ignore
             headers=headers_list,
             data=body,
+            allow_redirects=False,
         ) as resp:
             return await self._marshal_response(resp)
 

packages/smithy-http/tests/unit/aio/test_aiohttp.py

@@ -51,6 +51,20 @@ async def test_send_preserves_explicitly_framed_empty_body() -> None:
     assert session.request.call_args.kwargs["data"] is body
 
 
+async def test_send_disables_redirects() -> None:
+    client, session = _create_client()
+    request = HTTPRequest(
+        method="GET",
+        destination=URI(scheme="https", host="example.com", path="/"),
+        body=AsyncBytesReader(b""),
+        fields=Fields(),
+    )
+
+    await client.send(request)
+
+    assert session.request.call_args.kwargs["allow_redirects"] is False
+
+
 async def test_prepare_body_preserves_nonempty_reader_position() -> None:
     client, _ = _create_client()
     body = AsyncBytesReader(b"request body")