Fix incorrect annotation
@@ -144,7 +144,7 @@ class AIOHTTPParser(AsyncParser):
req: Request,
schema: Schema,
error_status_code: typing.Union[int, None] = None,
- error_headers: typing.Union[int, None] = None,
+ error_headers: typing.Union[typing.Mapping[str, str], None] = None,
) -> typing.NoReturn:
"""Handle ValidationErrors and return a JSON response of error messages
to the client.
