diff --git a/python/paddle_serving_server_gpu/web_service.py b/python/paddle_serving_server_gpu/web_service.py
index 37425acd6b7209fbdcf38a52c5a78e0c15b4cf61..7624ab259111dcba6e53fd178ed53cdafbdec61e 100644
--- a/python/paddle_serving_server_gpu/web_service.py
+++ b/python/paddle_serving_server_gpu/web_service.py
@@ -104,13 +104,26 @@ class WebService(object):
             abort(400)
         if "fetch" not in request.json:
             abort(400)
-        feed, fetch = self.preprocess(request.json, request.json["fetch"])
-        fetch_map_batch = self.client.predict(feed=feed, fetch=fetch)
-        fetch_map_batch = self.postprocess(
-            feed=request.json, fetch=fetch, fetch_map=fetch_map_batch)
-        for key in fetch_map_batch:
-            fetch_map_batch[key] = fetch_map_batch[key].tolist()
-        result = {"result": fetch_map_batch}
+        try:
+            feed, fetch = self.preprocess(request.json, request.json["fetch"])
+            if isinstance(feed, list):
+                fetch_map_batch = self.client.predict(
+                    feed_batch=feed, fetch=fetch)
+                fetch_map_batch = self.postprocess(
+                    feed=request.json, fetch=fetch, fetch_map=fetch_map_batch)
+                for key in fetch_map_batch:
+                    fetch_map_batch[key] = fetch_map_batch[key].tolist()
+                result = {"result": fetch_map_batch}
+            elif isinstance(feed, dict):
+                if "fetch" in feed:
+                    del feed["fetch"]
+                fetch_map = self.client.predict(feed=feed, fetch=fetch)
+                for key in fetch_map:
+                    fetch_map[key] = fetch_map[key][0].tolist()
+                result = self.postprocess(
+                    feed=request.json, fetch=fetch, fetch_map=fetch_map)
+        except ValueError:
+            result = {"result": "Request Value Error"}
         return result
 
     def run_server(self):