[Frontend]Responses API supports chat_template_kwargs (#43761)

Signed-off-by: chaunceyjiang <[email protected]>

vllm/entrypoints/openai/responses/serving.py

@@ -1041,7 +1041,10 @@ class OpenAIServingResponses(OpenAIServing):
 
         # Use parser to extract and create response output items
         if self.parser:
-            parser = self.parser(tokenizer, request.tools)
+            chat_template_kwargs = self._effective_chat_template_kwargs(request)
+            parser = self.parser(
+                tokenizer, request.tools, chat_template_kwargs=chat_template_kwargs
+            )
             return parser.extract_response_outputs(
                 model_output=final_output.text,
                 model_output_token_ids=final_output.token_ids,
@@ -1378,7 +1381,15 @@ class OpenAIServingResponses(OpenAIServing):
         ],
     ) -> AsyncGenerator[StreamingResponsesResponse, None]:
         processor = SimpleStreamingEventProcessor()
-        parser = self.parser(tokenizer, request.tools) if self.parser else None
+        parser = (
+            self.parser(
+                tokenizer,
+                request.tools,
+                chat_template_kwargs=self._effective_chat_template_kwargs(request),
+            )
+            if self.parser
+            else None
+        )
 
         def _get_logprobs(
             output: CompletionOutput,