# What’s new in Tornado 2.4.1

## Nov 24, 2012

### Bug fixes

- Fixed a memory leak in `tornado.stack_context` that was especially likely with long-running `@gen.engine` functions.

- `tornado.auth.TwitterMixin` now works on Python 3.

- Fixed a bug in which `IOStream.read_until_close` with a streaming callback would sometimes pass the last chunk of data to the final callback instead of the streaming callback.