What’s new in Tornado 6.5.2¶

Aug 8, 2025¶

Fixed a bug that resulted in WebSocket pings not being sent at the configured interval.
Improved logging for invalid Host headers. This was previously logged as an uncaught exception with a stack trace, now it is simply a 400 response (logged as a warning in the access log).
Restored the host argument to HTTPServerRequest. This argument is deprecated and will be removed in the future, but its removal with no warning in 6.5.0 was a mistake.
Removed a debugging print statement that was left in the code.
Improved type hints for gen.multi.