What’s new in Tornado 1.0

July 22, 2010

We are pleased to announce the release of Tornado 1.0, available
from
http://github.com/downloads/facebook/tornado/tornado-1.0.tar.gz.
There have been many changes since version 0.2; here are some of
the highlights:

New features:
* Improved support for running other WSGI applications in a
  Tornado server (tested with Django and CherryPy)
* Improved performance on Mac OS X and BSD (kqueue-based IOLoop),
  and experimental support for win32
* Rewritten AsyncHTTPClient available as
  tornado.httpclient.AsyncHTTPClient2 (this will become the
  default in a future release)
* Support for standard .mo files in addition to .csv in the locale
  module
* Pre-forking support for running multiple Tornado processes at
  once (see HTTPServer.start())
* SSL and gzip support in HTTPServer
* reverse_url() function refers to urls from the Application
  config by name from templates and RequestHandlers
* RequestHandler.on_connection_close() callback is called when the
  client has closed the connection (subject to limitations of the
  underlying network stack, any proxies, etc)
* Static files can now be served somewhere other than /static/ via
  the static_url_prefix application setting
* URL regexes can now use named groups ("(?P<name>)") to pass
  arguments to get()/post() via keyword instead of position
* HTTP header dictionary-like objects now support multiple values
  for the same header via the get_all() and add() methods.
* Several new options in the httpclient module, including
  prepare_curl_callback and header_callback
* Improved logging configuration in tornado.options.
* UIModule.html_body() can be used to return html to be inserted
  at the end of the document body.

Backwards-incompatible changes:
* RequestHandler.get_error_html() now receives the exception
  object as a keyword argument if the error was caused by an
  uncaught exception.
* Secure cookies are now more secure, but incompatible with
  cookies set by Tornado 0.2.  To read cookies set by older
  versions of Tornado, pass include_name=False to
  RequestHandler.get_secure_cookie()
* Parameters passed to RequestHandler.get/post() by extraction
  from the path now have %-escapes decoded, for consistency with
  the processing that was already done with other query
  parameters.

Many thanks to everyone who contributed patches, bug reports, and
feedback that went into this release!

-Ben

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