If an error code is not provided to the stream's close function then assume it is a gracefull shutdown.

Author: jdecuyper

hyper/http20/stream.py

@@ -368,8 +368,9 @@ def close(self, error_code=None):
         :returns: Nothing.
         """
         # Right now let's not bother with grace, let's just call close on the
-        # connection.
-        self._close_cb(self.stream_id, error_code)
+        # connection. If not error code is provided then assume it is a
+        # gracefull shutdown.
+        self._close_cb(self.stream_id, error_code or 0)
 
     def _handle_header_block(self, headers):
         """