增加SDK重试标记请求头x-cos-sdk-retry

Author: libertyzhu

qcloud_cos/cos_client.py

@@ -392,6 +392,7 @@ def send_request(self, method, url, bucket=None, timeout=30, cos_request=True, c
             try:
                 if j != 0:
                     if client_can_retry(file_position, **kwargs):
+                        kwargs['headers']['x-cos-sdk-retry'] = 'true' # SDK重试标记
                         time.sleep(j)
                     else:
                         break