diff --git a/speechserving/speechserving/engine/asr/python/asr_engine.py b/speechserving/speechserving/engine/asr/python/asr_engine.py
index e8289332..a18f906a 100644
--- a/speechserving/speechserving/engine/asr/python/asr_engine.py
+++ b/speechserving/speechserving/engine/asr/python/asr_engine.py
@@ -81,7 +81,6 @@ class ASRServerExecutor(ASRExecutor):
         """
 
         audio_file = input
-        # logger.info("Preprocess audio_file:" + audio_file)
 
         # Get the object for feature extraction
         if "deepspeech2online" in model_type or "deepspeech2offline" in model_type:
diff --git a/speechserving/speechserving/engine/engine_factory.py b/speechserving/speechserving/engine/engine_factory.py
index 2b9f9db7..bc0c4565 100644
--- a/speechserving/speechserving/engine/engine_factory.py
+++ b/speechserving/speechserving/engine/engine_factory.py
@@ -11,15 +11,18 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from typing import Text
+
 from engine.asr.python.asr_engine import ASREngine
 from engine.tts.python.tts_engine import TTSEngine
 
+
 __all__ = ['EngineFactory']
 
 
 class EngineFactory(object):
     @staticmethod
-    def get_engine(engine_name: str):
+    def get_engine(engine_name: Text):
         if engine_name == 'asr':
             return ASREngine()
         elif engine_name == 'tts':
diff --git a/speechserving/speechserving/restful/asr_api.py b/speechserving/speechserving/restful/asr_api.py
index 6ac647bc..c63cd76c 100644
--- a/speechserving/speechserving/restful/asr_api.py
+++ b/speechserving/speechserving/restful/asr_api.py
@@ -42,7 +42,7 @@ def help():
             "global": "success"
         },
         "result": {
-            "description": "tts server",
+            "description": "asr server",
             "input": "base64 string of wavfile",
             "output": "transcription"
         }
diff --git a/speechserving/tests/16_audio.wav b/speechserving/tests/16_audio.wav
new file mode 100644
index 00000000..3cfa5074
Binary files /dev/null and b/speechserving/tests/16_audio.wav differ
diff --git a/speechserving/tests/http_client.py b/speechserving/tests/http_client.py
index 73f5c18d..14adb574 100644
--- a/speechserving/tests/http_client.py
+++ b/speechserving/tests/http_client.py
@@ -14,10 +14,8 @@ import requests
 import json
 import time
 import base64
-import soundfile
 import io
 
-import argparse
 
 def readwav2base64(wav_file):
     """
@@ -29,7 +27,7 @@ def readwav2base64(wav_file):
     return base64_string
 
 
-def main(args):
+def main():
     """
     main func
     """
@@ -58,9 +56,4 @@ def main(args):
 
 
 if __name__ == "__main__":
-    parser = argparse.ArgumentParser()
-    parser.add_argument("--model_type", action="store",
-                        help="model type: u2, dp2", default="dp2")
-    args = parser.parse_args()
-
-    main(args)
+    main()