What’s new in Tornado 4.5.3¶

Jan 6, 2018¶

`tornado.curl_httpclient`¶

Improved debug logging on Python 3.

`tornado.httpserver`¶

Content-Length and Transfer-Encoding headers are no longer sent with 1xx or 204 responses (this was already true of 304 responses).
Reading chunked requests no longer leaves the connection in a broken state.

`tornado.iostream`¶

Writing a memoryview can no longer result in “BufferError: Existing exports of data: object cannot be re-sized”.

`tornado.options`¶

Duplicate option names are now detected properly whether they use hyphens or underscores.

`tornado.testing`¶

AsyncHTTPTestCase.fetch now uses 127.0.0.1 instead of localhost, improving compatibility with systems that have partially-working ipv6 stacks.

`tornado.web`¶

It is no longer allowed to send a body with 1xx or 204 responses.

`tornado.websocket`¶

Requests with invalid websocket headers now get a response with status code 400 instead of a closed connection.