- The build will now fall back to pure-python mode if the C extension fails to build for any reason (previously it would fall back for some errors but not others).
- .IOLoop.call_at and .IOLoop.call_later now always return a timeout handle for use with .IOLoop.remove_timeout.
- If any callback of a .PeriodicCallback or .IOStream returns a .Future, any error raised in that future will now be logged (similar to the behavior of .IOLoop.add_callback).
- Fixed an exception in client-side websocket connections when the connection is closed.
simple_httpclientonce again correctly handles 204 status codes with no content-length header.- Fixed a regression in
simple_httpclientthat would result in timeouts for certain kinds of errors.