overriding in a subclass. • Types for RequestHandler.get_body_argument and get_query_argument are improved and now match the get_argument method. • RequestHandler.get_cookie now has more accurate types longer allowed in (incoming) header values. • Handling of trailing whitespace in headers has been improved, especially with obs-fold continuation lines. • The Host header is now restricted to the set of Application setting xsrf_cookie_name can now be used to take advantage of the __Host cookie prefix for improved security. To use it, add {"xsrf_cookie_name": "__Host-xsrf", "xsrf_cookie_kwargs": {"secure": True}}

Future versions will require Python 3.6 or newer. General changes • Windows support has been improved. Tornado is now compatible with the proactor event loop (which became the default in Python 3.8) set_blocking_log_threshold, IOLoop.log_stack, and IOLoop.handle_callback_exception have been removed. • Improved performance of IOLoop.add_callback. 6.9. Release notes 157 Tornado Documentation, Release 6.1 RequestHandler.finish could fail to resolve. • The TwitterMixin.authenticate_redirect method works again. • Improved error handling in the tornado.auth module, fixing hanging requests when a network or other error

Application setting xsrf_cookie_name can now be used to take advantage of the __Host cookie prefix for improved security. To use it, add {"xsrf_cookie_name": "__Host-xsrf", "xsrf_cookie_kwargs": {"secure": True}} StaticFileHandler subclass, the reset() method is now called on this subclass instead of the base class. • Improved handling of the Accept-Language header. • Application.listen now supports more arguments to pass Future versions will require Python 3.6 or newer. General changes • Windows support has been improved. Tornado is now compatible with the proactor event loop (which became the default in Python 3.8)

Application setting xsrf_cookie_name can now be used to take advantage of the __Host cookie prefix for improved security. To use it, add {"xsrf_cookie_name": "__Host-xsrf", "xsrf_cookie_kwargs": {"secure": True}} StaticFileHandler subclass, the reset() method is now called on this subclass instead of the base class. • Improved handling of the Accept-Language header. • Application.listen now supports more arguments to pass Future versions will require Python 3.6 or newer. General changes • Windows support has been improved. Tornado is now compatible with the proactor event loop (which became the default in Python 3.8)

Application setting xsrf_cookie_name can now be used to take advantage of the __Host cookie prefix for improved security. To use it, add {"xsrf_cookie_name": "__Host-xsrf", "xsrf_cookie_kwargs": {"secure": True}} StaticFileHandler subclass, the reset() method is now called on this subclass instead of the base class. • Improved handling of the Accept-Language header. • Application.listen now supports more arguments to pass Future versions will require Python 3.6 or newer. General changes • Windows support has been improved. Tornado is now compatible with the proactor event loop (which became the default in Python 3.8)

Application setting xsrf_cookie_name can now be used to take advantage of the __Host cookie prefix for improved security. To use it, add {"xsrf_cookie_name": "__Host-xsrf", "xsrf_cookie_kwargs": {"secure": True}} StaticFileHandler subclass, the reset() method is now called on this subclass instead of the base class. • Improved handling of the Accept-Language header. • Application.listen now supports more arguments to pass Future versions will require Python 3.6 or newer. General changes • Windows support has been improved. Tornado is now compatible with the proactor event loop (which became the default in Python 3.8)

set_blocking_log_threshold, IOLoop.log_stack, and IOLoop.handle_callback_exception have been removed. • Improved performance of IOLoop.add_callback. tornado.iostream • All callback arguments in this module have authenticate_redirect method works again. 154 Chapter 6. Documentation Tornado Documentation, Release 6.0.4 • Improved error handling in the tornado.auth module, fixing hanging requests when a network or other error and BaseIOStream. read_until_close are deprecated and will be removed in 6.0. tornado.netutil • Improved compatibility with GNU Hurd. tornado.options • tornado.options.parse_config_file now allows setting

environment first to ensure that the migration runs successfully. What’s new in 5.0.0 Editor experience: Improved turn-around times python -m manage migrate Significant improvements have been made to enhance form. To enable this quick creation of content, set the plugin’s property show_add_form to False. Improved plugin updates One of the key changes is the introduction of a new mechanism for handling plugin of fetched placeholders, solving another n+1 issue when accessing placeholder.source. Security: Improved content security policy support Earlier versions of django CMS added inline JavaScript to the page

StaticFileHandler subclass, the reset() method is now called on this subclass instead of the base class. • Improved handling of the Accept-Language header. • Application.listen now supports more arguments to pass Future versions will require Python 3.6 or newer. General changes • Windows support has been improved. Tornado is now compatible with the proactor event loop (which became the default in Python 3.8) set_blocking_log_threshold, IOLoop. log_stack, and IOLoop.handle_callback_exception have been removed. • Improved performance of IOLoop.add_callback. tornado.iostream • All callback arguments in this module have

authenticate_redirect method works again. 5.9. Release notes 157 Tornado Documentation, Release 5.1.1 • Improved error handling in the tornado.auth module, fixing hanging requests when a network or other error removed in 6.0. 5.9. Release notes 159 Tornado Documentation, Release 5.1.1 tornado.netutil • Improved compatibility with GNU Hurd. tornado.options • tornado.options.parse_config_file now allows setting between asyncio.Future and Tornado’s previous Future implementation. tornado.curl_httpclient • Improved debug logging on Python 3. • The time_info response attribute now includes appconnect in addition