diff --git a/python2/httplib2/__init__.py b/python2/httplib2/__init__.py
index 6fa3cc6..84ee727 100644
--- a/python2/httplib2/__init__.py
+++ b/python2/httplib2/__init__.py
@@ -1270,6 +1270,8 @@ def _conn_request(self, conn, request_uri, method, body, headers):
             try:
                 if hasattr(conn, 'sock') and conn.sock is None:
                     conn.connect()
+                if hasattr(body, 'tell') and body.tell() > 0:
+                    body.seek(0) # rewind for retry send file
                 conn.request(method, request_uri, body, headers)
             except socket.timeout:
                 raise
diff --git a/python3/httplib2/__init__.py b/python3/httplib2/__init__.py
index 3ce019e..c21a8a8 100644
--- a/python3/httplib2/__init__.py
+++ b/python3/httplib2/__init__.py
@@ -985,6 +985,8 @@ def _conn_request(self, conn, request_uri, method, body, headers):
             try:
                 if conn.sock is None:
                     conn.connect()
+                if hasattr(body, 'tell') and body.tell() > 0:
+                    body.seek(0) # rewind for retry send file
                 conn.request(method, request_uri, body, headers)
             except socket.timeout:
                 conn.close()