From 966b047dd5ff7e67b6afe4156172c1e3d53ba0fa Mon Sep 17 00:00:00 2001
From: jibanez-staticduo <staticduo@gmail.com>
Date: Thu, 1 Oct 2026 11:37:01 +0200
Subject: [PATCH] fix: keep legacy SDP rejection response immutable

---
 litellm/proxy/realtime_endpoints/endpoints.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/litellm/proxy/realtime_endpoints/endpoints.py b/litellm/proxy/realtime_endpoints/endpoints.py
index 1e40c41e9d6..59c3f59e427 100644
--- a/litellm/proxy/realtime_endpoints/endpoints.py
+++ b/litellm/proxy/realtime_endpoints/endpoints.py
@@ -429,7 +429,7 @@ async def proxy_realtime_calls(
     decoded_payload: Final = _decode_realtime_token_payload(decrypted_token_value)
     if decoded_payload is None and decrypted_token_value.lstrip().startswith(("{", "[")):
         return Response(
-            content=json.dumps({"error": "Invalid or expired token"}),
+            content='{"error":"Invalid or expired token"}',
             status_code=http_status.HTTP_401_UNAUTHORIZED,
             media_type="application/json",
         )