What's new in Tornado 5.0.2

Apr 7, 2018

Fixed a memory leak when .IOLoop objects are created and destroyed.
If .AsyncTestCase.get_new_ioloop returns a reference to a preexisting event loop (typically when it has been overridden to return .IOLoop.current()), the test's tearDown method will not close this loop.
Fixed a confusing error message when the synchronous .HTTPClient fails to initialize because an event loop is already running.
.PeriodicCallback no longer executes twice in a row due to backwards clock adjustments.