Sourced from tornado's changelog.

Release notes

.. toctree:: :maxdepth: 2

releases/v6.5.2 releases/v6.5.1 releases/v6.5.0 releases/v6.4.2 releases/v6.4.1 releases/v6.4.0 releases/v6.3.3 releases/v6.3.2 releases/v6.3.1 releases/v6.3.0 releases/v6.2.0 releases/v6.1.0 releases/v6.0.4 releases/v6.0.3 releases/v6.0.2 releases/v6.0.1 releases/v6.0.0 releases/v5.1.1 releases/v5.1.0 releases/v5.0.2 releases/v5.0.1 releases/v5.0.0 releases/v4.5.3 releases/v4.5.2 releases/v4.5.1 releases/v4.5.0 releases/v4.4.3 releases/v4.4.2 releases/v4.4.1 releases/v4.4.0 releases/v4.3.0 releases/v4.2.1 releases/v4.2.0 releases/v4.1.0 releases/v4.0.2 releases/v4.0.1 releases/v4.0.0 releases/v3.2.2 releases/v3.2.1 releases/v3.2.0 releases/v3.1.1 releases/v3.1.0 releases/v3.0.2 releases/v3.0.1

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• 547e6d8 Merge pull request #3529 from bdarnell/relnotes-652
• be9c374 Release notes for 6.5.2
• 8cbc4bf Merge pull request #3527 from bdarnell/backports-6.5.2
• c0d3e6d http1connection: Improve error logging for invalid host headers
• 4ff5594 httputil: Restore the host argument to HTTPServerRequest
• b16916c Add overloads to gen.multi() (#3515)
• b5d2f3c httputil: Remove a debug print left in by mistake
• 38c6f59 Merge pull request #3513 from oliver-sanders/3258.fix
• 3fc1d91 websocket: Expand testing of next-ping calculation
• 56fc23f websocket_ping: fix ping interval with non-zero timeout and improve docs.
• Additional commits viewable in compare view

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