diff --git a/qcloud_cos/cos_client.py b/qcloud_cos/cos_client.py
index 48dcd07b..3d0e4a68 100644
--- a/qcloud_cos/cos_client.py
+++ b/qcloud_cos/cos_client.py
@@ -968,7 +968,7 @@ def create_bucket(self, Bucket, **kwargs):
                 method='PUT',
                 url=url,
                 bucket=Bucket,
-                auth=CosS3Auth(self._conf._secret_id, self._conf._secret_key),
+                auth=CosS3Auth(self._conf),
                 headers=headers)
         return None
 
@@ -997,7 +997,7 @@ def delete_bucket(self, Bucket, **kwargs):
                 method='DELETE',
                 url=url,
                 bucket=Bucket,
-                auth=CosS3Auth(self._conf._secret_id, self._conf._secret_key),
+                auth=CosS3Auth(self._conf),
                 headers=headers)
         return None
 
@@ -1242,7 +1242,7 @@ def head_bucket(self, Bucket, **kwargs):
             method='HEAD',
             url=url,
             bucket=Bucket,
-            auth=CosS3Auth(self._conf._secret_id, self._conf._secret_key),
+            auth=CosS3Auth(self._conf),
             headers=headers)
         return None
 
@@ -2114,7 +2114,7 @@ def list_buckets(self, **kwargs):
                 url=url,
                 bucket=None,
                 headers=headers,
-                auth=CosS3Auth(self._conf._secret_id, self._conf._secret_key),
+                auth=CosS3Auth(self._conf),
                 )
         data = xml_to_dict(rt.content)
         if data['Buckets'] is not None and not isinstance(data['Buckets']['Bucket'], list):
diff --git a/qcloud_cos/cos_comm.py b/qcloud_cos/cos_comm.py
index 6164b5c3..5b644c62 100644
--- a/qcloud_cos/cos_comm.py
+++ b/qcloud_cos/cos_comm.py
@@ -348,7 +348,10 @@ def get_file_like_object_length(data):
         else:
             # support BytesIO file-like object
             total_length = len(data.getvalue())
-    current_position = data.tell()
+    try:
+        current_position = data.tell()
+    except IOError:
+        current_position = 0
     content_len = total_length - current_position
     return content_len