diff --git a/comps/cores/mega/gateway.py b/comps/cores/mega/gateway.py
index 10decfa1f..69324a650 100644
--- a/comps/cores/mega/gateway.py
+++ b/comps/cores/mega/gateway.py
@@ -544,18 +544,24 @@ def __init__(self, megaservice, host="0.0.0.0", port=8889):
         )
 
     async def handle_request(self, request: Request):
+        def parser_input(data, TypeClass, key):
+            try:
+                chat_request = TypeClass.parse_obj(data)
+                query = getattr(chat_request, key)
+            except:
+                query = None
+            return query
+
         data = await request.json()
-        if isinstance(request, TextDoc):
-            chat_request = TextDoc.parse_obj(data)
-            query = chat_request.text
-        elif isinstance(request, EmbeddingRequest):
-            chat_request = EmbeddingRequest.parse_obj(data)
-            query = chat_request.input
-        elif isinstance(request, ChatCompletionRequest):
-            chat_request = ChatCompletionRequest.parse_obj(data)
-            query = chat_request.input
-        result_dict = await self.megaservice.schedule(initial_inputs={"text": query})
-        for node, response in result_dict.items():
-            print("Node: {}\nResponse: {}".format(node, response))
-            if self.megaservice.services[node].service_type == ServiceType.RERANK:
-                return response
+        query = None
+        for key, TypeClass in zip(["text", "input", "input"], [TextDoc, EmbeddingRequest, ChatCompletionRequest]):
+            query = parser_input(data, TypeClass, key)
+            if query is not None:
+                break
+        if query is None:
+            raise ValueError(f"Unknown request type: {data}")
+        result_dict, runtime_graph = await self.megaservice.schedule(initial_inputs={"text": query})
+        last_node = runtime_graph.all_leaves()[-1]
+        response = result_dict[last_node]
+        print("response is ", response)
+        return response