Tornado 2.1 新特性¶

Support for secure cookies written by pre-1.0 releases of Tornado hasbeen removed. The RequestHandler.get_secure_cookie method no longertakes an include_name parameter.
The debug application setting now causes stack traces to be displayedin the browser on uncaught exceptions. Since this may leak sensitiveinformation, debug mode is not recommended for public-facing servers.

Diginotar has been removed from the default CA certificates file usedby SimpleAsyncHTTPClient.

: A generator-based interface to simplify writingasynchronous functions.
tornado.netutil: Parts of have been extracted intoa new module for use with non-HTTP protocols.
tornado.platform.twisted: A bridge between the Tornado IOLoop and theTwisted Reactor, allowing code written for Twisted to be run on Tornado.
: Multi-process mode has been improved, and can now restartcrashed child processes. A new entry point has been added attornado.process.fork_processes, althoughtornado.httpserver.HTTPServer.start is still supported.

replaces get_error_html as thepreferred way to generate custom error pages (get_error_html is stillsupported, but deprecated)
In tornado.web.Application, handlers may be specified by(fully-qualified) name instead of importing and passing the class objectitself.
It is now possible to use a custom subclass of StaticFileHandlerwith the static_handler_class application setting, and this subclasscan override the behavior of the static_url method.
subclasses can now overrideget_cache_time to customize cache control behavior.
tornado.web.RequestHandler.get_secure_cookie now has a max_age_daysparameter to allow applications to override the default one-month expiration.
may be overridden to setheaders in a way that does not get reset during error handling.
RequestHandler.add_header can now be used to set a header that canappear multiple times in the response.
can now take a callback for flow control.
The application/json content type can now be gzipped.
The cookie-signing functions are now accessible as static functionstornado.web.create_signed_value and tornado.web.decode_signed_value.

To facilitate some advanced multi-process scenarios, HTTPServerhas a new method add_sockets, and socket-opening code isavailable separately as .
The cookies property is now available on tornado.httpserver.HTTPRequest(it is also available in its old location as a property ofRequestHandler)
tornado.httpserver.HTTPServer.bind now takes a backlog argument with thesame meaning as socket.listen.
can now be run on a unix socket as wellas TCP.
Fixed exception at startup when socket.AI_ADDRCONFIG is not available,as on Windows XP

performance has been improved, especially forsmall synchronous requests.
New methods tornado.iostream.IOStream.read_until_close andtornado.iostream.IOStream.read_until_regex.
IOStream.read_bytes and IOStream.read_until_close now take astreaming_callback argument to return data as it is received ratherthan all at once.
IOLoop.add_timeout now accepts objects in additionto absolute timestamps.
PeriodicCallback now sticks to the specified periodinstead of creeping later due to accumulated errors.
and tornado.httpclient.HTTPClient now haveclose() methods that should be used in applications that createand destroy many of these objects.
can now be used to use a custom subclass of IOLoopas the singleton without monkey-patching.
IOStream should now always call the close callbackinstead of the connect callback on a connection error.
The close callback will no longer be called while thereare pending read callbacks that can be satisfied with buffered data.

Now supports client SSL certificates with the client_key andclient_cert parameters to tornado.httpclient.HTTPRequest
Now takes a maximum buffer size, to allow reading files larger than 100MB
Now works with HTTP 1.0 servers that don’t send a Content-Length header
Fixed file descriptor leaks and multiple callback invocations inSimpleAsyncHTTPClient
No longer consumes extra connection resources when following redirects.
Now works with buggy web servers that separate headers with \n insteadof \r\n\r\n.
Now sets response.request_time correctly.
Connect timeouts now work correctly.

tornado.auth.OpenIdMixin now uses the correct realm when thecallback URI is on a different domain.
has a new command-line interface which can be usedto wrap any script. This replaces the —autoreload argument totornado.testing.main and is more robust against syntax errors.
can be used to watch files other thanthe sources of imported modules.
tornado.database.Connection has new variants of execute andexecutemany that return the number of rows affected instead ofthe last inserted row id.
tornado.locale.load_translations now accepts any properly-formattedlocale name, not just those in the predefined LOCALE_NAMES list.
now takes a group parameter to group optionsin —help output.
Template loaders now take a namespace constructor argument to addentries to the template namespace.
tornado.websocket now supports the latest (“hybi-10”) version of theprotocol (the old version, “hixie-76” is still supported; the correctversion is detected automatically).
now works on Python 3

Windows support has been improved. Windows is still not an officiallysupported platform, but the test suite now passes and works.
Uploading files whose names contain special characters will now work.
Cookie values containing special characters are now properly quotedand unquoted.
Multi-line headers are now supported.
Repeated Content-Length headers (which may be added by certain proxies)are now supported in HTTPServer.
Unicode string literals now work in template expressions.
The template {% module %} directive now works even if applicationsuse a template variable named modules.
Requests with “Expect: 100-continue” now work on python 3