[Refactor] Remove deadcode in Responses API serving (#36726)

Signed-off-by: sfeng33 <4florafeng@gmail.com>
Co-authored-by: Signed-off-by: yewentao256 <zhyanwentao@126.com>

vllm/entrypoints/openai/responses/serving.py

@@ -1102,7 +1102,6 @@ class OpenAIServingResponses(OpenAIServing):
         event_deque: deque[StreamingResponsesResponse] = deque()
         new_event_signal = asyncio.Event()
         self.event_store[request.request_id] = (event_deque, new_event_signal)
-        response = None
         generator = self.responses_stream_generator(request, *args, **kwargs)
         try:
             async for event in generator:
@@ -1111,15 +1110,6 @@ class OpenAIServingResponses(OpenAIServing):
         finally:
             new_event_signal.set()
 
-        if response is not None and isinstance(response, ErrorResponse):
-            # If the request has failed, update the status to "failed".
-            response_id = request.request_id
-            async with self.response_store_lock:
-                stored_response = self.response_store.get(response_id)
-                assert stored_response is not None
-                if stored_response.status not in ("completed", "cancelled"):
-                    stored_response.status = "failed"
-
     async def _run_background_request(
         self,
         request: ResponsesRequest,
@@ -1226,19 +1216,6 @@ class OpenAIServingResponses(OpenAIServing):
             param="response_id",
         )
 
-    def _make_store_not_supported_error(self) -> ErrorResponse:
-        return self.create_error_response(
-            err_type="invalid_request_error",
-            message=(
-                "`store=True` (default) is not supported. Please set "
-                "`store=False` in Responses API or set "
-                "`VLLM_ENABLE_RESPONSES_API_STORE=1` in the env var when "
-                "starting the vLLM server."
-            ),
-            status_code=HTTPStatus.BAD_REQUEST,
-            param="store",
-        )
-
     async def _process_simple_streaming_events(
         self,
         request: ResponsesRequest,