Tornado 2.2 新特性¶

Jan 30, 2012¶

Highlights¶

• Updated and expanded WebSocket support.
• Improved compatibility in the Twisted/Tornado bridge.
• Template errors now generate better stack traces.
• Better exception handling in tornado.gen.

Security fixes¶

• tornado.simple_httpclient now disables SSLv2 in all cases. PreviouslySSLv2 would be allowed if the Python interpreter was linked against apre-1.0 version of OpenSSL.

Backwards-incompatible changes¶

• tornado.process.fork_processes now raises SystemExit if all childprocesses exit cleanly rather than returning None. The old behaviorwas surprising and inconsistent with most of the documented examplesof this function (which did not check the return value).
• On Python 2.6, tornado.simple_httpclient only supports SSLv3. Thisis because Python 2.6 does not expose a way to support both SSLv3 and TLSv1without also supporting the insecure SSLv2.
• tornado.websocket no longer supports the older “draft 76” versionof the websocket protocol by default, although this version canbe enabled by overriding tornado.websocket.WebSocketHandler.allow_draft76.

tornado.httpclient¶

• SimpleAsyncHTTPClient no longer hangs on HEAD requests,responses with no content, or empty POST/PUT response bodies.
• SimpleAsyncHTTPClient now supports 303 and 307 redirect codes.
• tornado.curl_httpclient now accepts non-integer timeouts.
• tornado.curl_httpclient now supports basic authentication with anempty password.

tornado.httpserver¶

• HTTPServer with xheaders=True will no longer acceptX-Real-IP headers that don’t look like valid IP addresses.
• HTTPServer now treats the Connection request header ascase-insensitive.

tornado.ioloop and tornado.iostream¶

• IOStream.write now works correctly when given an empty string.
• IOStream.read_until (and read_until_regex) now perform betterwhen there is a lot of buffered data, which improves peformance ofSimpleAsyncHTTPClient when downloading files with lots ofchunks.
• SSLIOStream now works correctly when ssl_version is set toa value other than SSLv23.
• Idle IOLoops no longer wake up several times a second.
• tornado.ioloop.PeriodicCallback no longer triggers duplicate callbackswhen stopped and started repeatedly.

tornado.template¶

• Exceptions in template code will now show better stack traces thatreference lines from the original template file.
• {# and #} can now be used for comments (and unlike the old{% comment %} directive, these can wrap other template directives).
• Template directives may now span multiple lines.

tornado.web¶

• Now behaves better when given malformed Cookie headers
• RequestHandler.redirect now has a status argument to sendstatus codes other than 301 and 302.
• New method RequestHandler.on_finish may be overridden for post-requestprocessing (as a counterpart to RequestHandler.prepare)
• StaticFileHandler now outputs Content-Length and Etag headerson HEAD requests.
• StaticFileHandler now has overridable get_version andparse_url_path methods for use in subclasses.
• RequestHandler.static_url now takes an include_host parameter(in addition to the old support for the RequestHandler.include_hostattribute).

tornado.websocket¶

• Updated to support the latest version of the protocol, as finalizedin RFC 6455.
• Many bugs were fixed in all supported protocol versions.
• tornado.websocket no longer supports the older “draft 76” versionof the websocket protocol by default, although this version canbe enabled by overriding tornado.websocket.WebSocketHandler.allow_draft76.
• WebSocketHandler.write_message now accepts a binary argumentto send binary messages.
• Subprotocols (i.e. the Sec-WebSocket-Protocol header) are now supported;see the WebSocketHandler.select_subprotocol method for details.
• .WebSocketHandler.get_websocket_scheme can be used to select theappropriate url scheme (ws:// or wss://) in cases whereHTTPRequest.protocol is not set correctly.

Other modules¶

• tornado.auth.TwitterMixin.authenticate_redirect now takes acallback_uri parameter.
• tornado.auth.TwitterMixin.twitter_request now accepts both URLs andpartial paths (complete URLs are useful for the search API which followsdifferent patterns).
• Exception handling in tornado.gen has been improved. It is now possibleto catch exceptions thrown by a Task.
• tornado.netutil.bind_sockets now works when getaddrinfo returnsduplicate addresses.
• tornado.platform.twisted compatibility has been significantly improved.Twisted version 11.1.0 is now supported in addition to 11.0.0.
• tornado.process.fork_processes correctly reseeds the random moduleeven when os.urandom is not implemented.
• tornado.testing.main supports a new flag —exception_on_interrupt,which can be set to false to make Ctrl-C kill the process morereliably (at the expense of stack traces when it does so).
• tornado.version_info is now a four-tuple so official releases can bedistinguished from development branches.

原文:

https://tornado-zh-cn.readthedocs.io/zh_CN/latest/releases/v2.2.0.html