tornado/docs/releases/v4.5.2.rst

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What's new in Tornado 4.5.2
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Aug 27, 2017
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Bug Fixes
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- Tornado now sets the ``FD_CLOEXEC`` flag on all file descriptors it creates. This prevents hanging client connections and resource leaks when the `tornado.autoreload` module (or ``Application(debug=True)``) is used.