diff --git a/litellm/rust_bridge/messages/route_host.py b/litellm/rust_bridge/messages/route_host.py
index 6d8073b740c..225817a2905 100644
--- a/litellm/rust_bridge/messages/route_host.py
+++ b/litellm/rust_bridge/messages/route_host.py
@@ -9,6 +9,7 @@ from pydantic import TypeAdapter, ValidationError
 
 import litellm
 from litellm.litellm_core_utils.core_helpers import normalize_drop_params
+from litellm.litellm_core_utils.core_helpers import process_response_headers
 from litellm.llms.anthropic.pass_through.utils import is_reasoning_auto_summary_enabled
 from litellm.router_utils.add_retry_fallback_headers import _add_headers_to_response
 from litellm.rust_bridge import failures
@@ -54,7 +55,10 @@ def response(
 ) -> AnthropicMessagesResponse:
     response_value = dict(value)
     if headers:
-        _add_headers_to_response(response_value, dict(httpx.Headers(list(headers)).items()))
+        _add_headers_to_response(
+            response_value,
+            process_response_headers(httpx.Headers(list(headers))),
+        )
     return cast(  # cast-ok: AnthropicMessagesResponse is a TypedDict over the normalized native payload
         AnthropicMessagesResponse,
         response_value,
diff --git a/tests/unit/rust_bridge/messages/test_route_host.py b/tests/unit/rust_bridge/messages/test_route_host.py
index 1be42e2249d..4b4b0dd6219 100644
--- a/tests/unit/rust_bridge/messages/test_route_host.py
+++ b/tests/unit/rust_bridge/messages/test_route_host.py
@@ -1,12 +1,13 @@
+from dataclasses import astuple
 from types import MappingProxyType
 from typing import Final
 
-from litellm.rust_bridge.messages.route_host import arguments, response
-from litellm.rust_bridge.messages.entrypoints import LiteLLMMessagesRequest
-from dataclasses import astuple
 import pytest
+
 import litellm
 from litellm.rust_bridge.messages import route_host
+from litellm.rust_bridge.messages.entrypoints import LiteLLMMessagesRequest
+from litellm.rust_bridge.messages.route_host import arguments, response
 
 
 def test_response_is_a_detached_public_messages_dict() -> None:
@@ -30,6 +31,17 @@ def test_response_is_a_detached_public_messages_dict() -> None:
     assert "_hidden_params" not in native
 
 
+def test_response_projects_upstream_headers_into_hidden_params() -> None:
+    built: Final = response(
+        MappingProxyType({"id": "msg_native"}),
+        (("request-id", "req_upstream_123"), ("x-ratelimit-remaining-requests", "41")),
+    )
+
+    additional: Final = built["_hidden_params"]["additional_headers"]
+    assert additional["llm_provider-request-id"] == "req_upstream_123"
+    assert additional["x-ratelimit-remaining-requests"] == "41"
+
+
 def test_arguments_are_the_public_kwargs_view() -> None:
     kwargs: Final = MappingProxyType({"litellm_metadata": {"user_id": "u"}})
     request: Final = LiteLLMMessagesRequest(