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v2.4.0

What's new in Tornado 2.4
=========================

Sep 4, 2012
-----------

General
~~~~~~~

* Fixed Python 3 bugs in `tornado.auth`, `tornado.locale`, and `tornado.wsgi`.

HTTP clients
~~~~~~~~~~~~

* Removed ``max_simultaneous_connections`` argument from `tornado.httpclient`
  (both implementations).  This argument hasn't been useful for some time
  (if you were using it you probably want ``max_clients`` instead)
* `tornado.simple_httpclient` now accepts and ignores HTTP 1xx status
  responses.

`tornado.ioloop` and `tornado.iostream`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* Fixed a bug introduced in 2.3 that would cause `IOStream` close callbacks
  to not run if there were pending reads.
* Improved error handling in `SSLIOStream` and SSL-enabled `TCPServer`.
* `SSLIOStream.get_ssl_certificate` now has a ``binary_form`` argument
  which is passed to ``SSLSocket.getpeercert``.
* `SSLIOStream.write` can now be called while the connection is in progress,
  same as non-SSL `IOStream` (but be careful not to send sensitive data until
  the connection has completed and the certificate has been verified).
* `IOLoop.add_handler` cannot be called more than once with the same file
  descriptor.  This was always true for ``epoll``, but now the other
  implementations enforce it too.
* On Windows, `TCPServer` uses `SO_EXCLUSIVEADDRUSER` instead of `SO_REUSEADDR`.

`tornado.template`
~~~~~~~~~~~~~~~~~~

* ``{% break %}`` and ``{% continue %}`` can now be used looping constructs
  in templates.
* It is no longer an error for an if/else/for/etc block in a template to
  have an empty body.

`tornado.testing`
~~~~~~~~~~~~~~~~~

* New class `tornado.testing.AsyncHTTPSTestCase` is like `AsyncHTTPTestCase`.
  but enables SSL for the testing server (by default using a self-signed
  testing certificate).
* `tornado.testing.main` now accepts additional keyword arguments and forwards
  them to `unittest.main`.

`tornado.web`
~~~~~~~~~~~~~

* New method `RequestHandler.get_template_namespace` can be overridden to
  add additional variables without modifying keyword arguments to
  `render_string`.
* `RequestHandler.add_header` now works with `WSGIApplication`.
* `RequestHandler.get_secure_cookie` now handles a potential error case.
* `RequestHandler.__init__` now calls ``super().__init__`` to ensure that
  all constructors are called when multiple inheritance is used.
* Docs have been updated with a description of all available
  :py:attr:`Application settings <tornado.web.Application.settings>`

Other modules
~~~~~~~~~~~~~

* `OAuthMixin` now accepts ``"oob"`` as a ``callback_uri``.
* `OpenIDMixin` now also returns the ``claimed_id`` field for the user.
* `tornado.platform.twisted` shutdown sequence is now more compatible.
* The logging configuration used in `tornado.options` is now more tolerant
  of non-ascii byte strings.

v2.3.0

What's new in Tornado 2.3
=========================

May 31, 2012
------------

HTTP clients
~~~~~~~~~~~~

* `tornado.httpclient.HTTPClient` now supports the same constructor
  keyword arguments as `AsyncHTTPClient`.
* The ``max_clients`` keyword argument to `AsyncHTTPClient.configure` now works.
* `tornado.simple_httpclient` now supports the ``OPTIONS`` and ``PATCH``
  HTTP methods.
* `tornado.simple_httpclient` is better about closing its sockets
  instead of leaving them for garbage collection.
* `tornado.simple_httpclient` correctly verifies SSL certificates for
  URLs containing IPv6 literals (This bug affected Python 2.5 and 2.6).
* `tornado.simple_httpclient` no longer includes basic auth credentials
  in the ``Host`` header when those credentials are extracted from the URL.
* `tornado.simple_httpclient` no longer modifies the caller-supplied header
  dictionary, which caused problems when following redirects.
* `tornado.curl_httpclient` now supports client SSL certificates (using
  the same ``client_cert`` and ``client_key`` arguments as
  `tornado.simple_httpclient`)

HTTP Server
~~~~~~~~~~~

* `HTTPServer` now works correctly with paths starting with ``//``
* `HTTPHeaders.copy` (inherited from `dict.copy`) now works correctly.
* `HTTPConnection.address` is now always the socket address, even for non-IP
  sockets.  `HTTPRequest.remote_ip` is still always an IP-style address
  (fake data is used for non-IP sockets)
* Extra data at the end of multipart form bodies is now ignored, which fixes
  a compatibility problem with an iOS HTTP client library.

``IOLoop`` and ``IOStream``
~~~~~~~~~~~~~~~~~~~~~~~~~~~

* `IOStream` now has an ``error`` attribute that can be used to determine
  why a socket was closed.
* `tornado.iostream.IOStream.read_until` and ``read_until_regex`` are much
  faster with large input.
* `IOStream.write` performs better when given very large strings.
* `IOLoop.instance()` is now thread-safe.

``tornado.options``
~~~~~~~~~~~~~~~~~~~

* `tornado.options` options with ``multiple=True`` that are set more than
  once now overwrite rather than append.  This makes it possible to override
  values set in `parse_config_file` with `parse_command_line`.
* `tornado.options` ``--help`` output is now prettier.
* `tornado.options.options` now supports attribute assignment.

``tornado.template``
~~~~~~~~~~~~~~~~~~~~

* Template files containing non-ASCII (utf8) characters now work on Python 3
  regardless of the locale environment variables.
* Templates now support ``else`` clauses in
  ``try``/``except``/``finally``/``else`` blocks.

``tornado.web``
~~~~~~~~~~~~~~~

* `tornado.web.RequestHandler` now supports the ``PATCH`` HTTP method.
  Note that this means any existing methods named ``patch`` in
  ``RequestHandler`` subclasses will need to be renamed.
* `tornado.web.addslash` and ``removeslash`` decorators now send permanent
  redirects (301) instead of temporary (302).
* `RequestHandler.flush` now invokes its callback whether there was any data
  to flush or not.
* Repeated calls to `RequestHandler.set_cookie` with the same name now
  overwrite the previous cookie instead of producing additional copies.
* `tornado.web.OutputTransform.transform_first_chunk` now takes and returns
  a status code in addition to the headers and chunk.  This is a
  backwards-incompatible change to an interface that was never technically
  private, but was not included in the documentation and does not appear
  to have been used outside Tornado itself.
* Fixed a bug on python versions before 2.6.5 when `URLSpec` regexes
  are constructed from unicode strings and keyword arguments are extracted.
* The ``reverse_url`` function in the template namespace now comes from
  the `RequestHandler` rather than the `Application`.  (Unless overridden,
  `RequestHandler.reverse_url` is just an alias for the `Application`
  method).
* The ``Etag`` header is now returned on 304 responses to an ``If-None-Match``
  request, improving compatibility with some caches.
* `tornado.web` will no longer produce responses with status code 304
  that also have entity headers such as ``Content-Length``.

Other modules
~~~~~~~~~~~~~

* `tornado.auth.FacebookGraphMixin` no longer sends ``post_args`` redundantly
  in the url.
* The ``extra_params`` argument to `tornado.escape.linkify` may now be
  a callable, to allow parameters to be chosen separately for each link.
* `tornado.gen` no longer leaks `StackContexts` when a ``@gen.engine`` wrapped
  function is called repeatedly.
* `tornado.locale.get_supported_locales` no longer takes a meaningless
  ``cls`` argument.
* `StackContext` instances now have a deactivation callback that can be
  used to prevent further propagation.
* `tornado.testing.AsyncTestCase.wait` now resets its timeout on each call.
* `tornado.wsgi.WSGIApplication` now parses arguments correctly on Python 3.
* Exception handling on Python 3 has been improved; previously some exceptions
  such as `UnicodeDecodeError` would generate `TypeErrors`

v2.2.1

What's new in Tornado 2.2.1
===========================

Apr 23, 2012
------------

Security fixes
~~~~~~~~~~~~~~

* `tornado.web.RequestHandler.set_header` now properly sanitizes input
  values to protect against header injection, response splitting, etc.
  (it has always attempted to do this, but the check was incorrect).
  Note that redirects, the most likely source of such bugs, are protected
  by a separate check in `RequestHandler.redirect`.

Bug fixes
~~~~~~~~~

* Colored logging configuration in `tornado.options` is compatible with
  Python 3.2.3 (and 3.3).

v2.2.0

What's new in Tornado 2.2
=========================

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.  Previously
  SSLv2 would be allowed if the Python interpreter was linked against a
  pre-1.0 version of OpenSSL.

Backwards-incompatible changes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* `tornado.process.fork_processes` now raises `SystemExit` if all child
  processes exit cleanly rather than returning ``None``.  The old behavior
  was surprising and inconsistent with most of the documented examples
  of this function (which did not check the return value).
* On Python 2.6, `tornado.simple_httpclient` only supports SSLv3.  This
  is because Python 2.6 does not expose a way to support both SSLv3 and TLSv1
  without also supporting the insecure SSLv2.
* `tornado.websocket` no longer supports the older "draft 76" version
  of the websocket protocol by default, although this version can
  be 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 an
  empty password.

``tornado.httpserver``
~~~~~~~~~~~~~~~~~~~~~~

* `HTTPServer` with ``xheaders=True`` will no longer accept
  ``X-Real-IP`` headers that don't look like valid IP addresses.
* `HTTPServer` now treats the ``Connection`` request header as
  case-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 better
  when there is a lot of buffered data, which improves peformance of
  `SimpleAsyncHTTPClient` when downloading files with lots of
  chunks.
* `SSLIOStream` now works correctly when ``ssl_version`` is set to
  a value other than ``SSLv23``.
* Idle ``IOLoops`` no longer wake up several times a second.
* `tornado.ioloop.PeriodicCallback` no longer triggers duplicate callbacks
  when stopped and started repeatedly.

``tornado.template``
~~~~~~~~~~~~~~~~~~~~

* Exceptions in template code will now show better stack traces that
  reference 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 send
  status codes other than 301 and 302.
* New method `RequestHandler.on_finish` may be overridden for post-request
  processing (as a counterpart to `RequestHandler.prepare`)
* `StaticFileHandler` now outputs ``Content-Length`` and ``Etag`` headers
  on ``HEAD`` requests.
* `StaticFileHandler` now has overridable ``get_version`` and
  ``parse_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_host`
  attribute).

``tornado.websocket``
~~~~~~~~~~~~~~~~~~~~~

* Updated to support the latest version of the protocol, as finalized
  in RFC 6455.
* Many bugs were fixed in all supported protocol versions.
* `tornado.websocket` no longer supports the older "draft 76" version
  of the websocket protocol by default, although this version can
  be enabled by overriding `tornado.websocket.WebSocketHandler.allow_draft76`.
* `WebSocketHandler.write_message` now accepts a ``binary`` argument
  to 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 the
  appropriate url scheme (``ws://`` or ``wss://``) in cases where
  `HTTPRequest.protocol` is not set correctly.

Other modules
~~~~~~~~~~~~~

* `tornado.auth.TwitterMixin.authenticate_redirect` now takes a
  ``callback_uri`` parameter.
* `tornado.auth.TwitterMixin.twitter_request` now accepts both URLs and
  partial paths (complete URLs are useful for the search API which follows
  different patterns).
* Exception handling in `tornado.gen` has been improved.  It is now possible
  to catch exceptions thrown by a ``Task``.
* `tornado.netutil.bind_sockets` now works when ``getaddrinfo`` returns
  duplicate 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` module
  even 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 more
  reliably (at the expense of stack traces when it does so).
* `tornado.version_info` is now a four-tuple so official releases can be
  distinguished from development branches.

v2.1.1

What's new in Tornado 2.1.1
===========================

Oct 4, 2011
-----------

Bug fixes
~~~~~~~~~

* Fixed handling of closed connections with the ``epoll`` (i.e. Linux)
  ``IOLoop``.  Previously, closed connections could be shut down too early,
  which most often manifested as "Stream is closed" exceptions in
  ``SimpleAsyncHTTPClient``.
* Fixed a case in which chunked responses could be closed prematurely,
  leading to truncated output.
* ``IOStream.connect`` now reports errors more consistently via logging
  and the close callback (this affects e.g. connections to localhost
  on FreeBSD).
* ``IOStream.read_bytes`` again accepts both ``int`` and ``long`` arguments.
* ``PeriodicCallback`` no longer runs repeatedly when ``IOLoop`` iterations
  complete faster than the resolution of ``time.time()`` (mainly a problem
  on Windows).

Backwards-compatibility note
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* Listening for ``IOLoop.ERROR`` alone is no longer sufficient for detecting
  closed connections on an otherwise unused socket.  ``IOLoop.ERROR`` must
  always be used in combination with ``READ`` or ``WRITE``.

v2.1.0

What's new in Tornado 2.1
=========================

Sep 20, 2011
------------

Backwards-incompatible changes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* Support for secure cookies written by pre-1.0 releases of Tornado has
  been removed.  The `RequestHandler.get_secure_cookie` method no longer
  takes an ``include_name`` parameter.
* The ``debug`` application setting now causes stack traces to be displayed
  in the browser on uncaught exceptions.  Since this may leak sensitive
  information, debug mode is not recommended for public-facing servers.

Security fixes
~~~~~~~~~~~~~~

* Diginotar has been removed from the default CA certificates file used
  by `SimpleAsyncHTTPClient`.

New modules
~~~~~~~~~~~

* `tornado.gen`:  A generator-based interface to simplify writing
  asynchronous functions.
* `tornado.netutil`:  Parts of `tornado.httpserver` have been extracted into
  a new module for use with non-HTTP protocols.
* `tornado.platform.twisted`:  A bridge between the Tornado IOLoop and the
  Twisted Reactor, allowing code written for Twisted to be run on Tornado.
* `tornado.process`:  Multi-process mode has been improved, and can now restart
  crashed child processes.  A new entry point has been added at
  `tornado.process.fork_processes`, although
  `tornado.httpserver.HTTPServer.start` is still supported.

``tornado.web``
~~~~~~~~~~~~~~~

* `tornado.web.RequestHandler.write_error` replaces ``get_error_html`` as the
  preferred way to generate custom error pages (``get_error_html`` is still
  supported, but deprecated)
* In `tornado.web.Application`, handlers may be specified by
  (fully-qualified) name instead of importing and passing the class object
  itself.
* It is now possible to use a custom subclass of ``StaticFileHandler``
  with the ``static_handler_class`` application setting, and this subclass
  can override the behavior of the ``static_url`` method.
* `~tornado.web.StaticFileHandler` subclasses can now override
  ``get_cache_time`` to customize cache control behavior.
* `tornado.web.RequestHandler.get_secure_cookie` now has a ``max_age_days``
  parameter to allow applications to override the default one-month expiration.
* `~tornado.web.RequestHandler.set_cookie` now accepts a ``max_age`` keyword
  argument to set the ``max-age`` cookie attribute (note underscore vs dash)
* `tornado.web.RequestHandler.set_default_headers` may be overridden to set
  headers in a way that does not get reset during error handling.
* `RequestHandler.add_header` can now be used to set a header that can
  appear multiple times in the response.
* `RequestHandler.flush` 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 functions
  `tornado.web.create_signed_value` and `tornado.web.decode_signed_value`.

``tornado.httpserver``
~~~~~~~~~~~~~~~~~~~~~~

* To facilitate some advanced multi-process scenarios, ``HTTPServer``
  has a new method ``add_sockets``, and socket-opening code is
  available separately as `tornado.netutil.bind_sockets`.
* The ``cookies`` property is now available on `tornado.httpserver.HTTPRequest`
  (it is also available in its old location as a property of
  `~tornado.web.RequestHandler`)
* `tornado.httpserver.HTTPServer.bind` now takes a backlog argument with the
  same meaning as ``socket.listen``.
* `~tornado.httpserver.HTTPServer` can now be run on a unix socket as well
  as TCP.
* Fixed exception at startup when ``socket.AI_ADDRCONFIG`` is not available,
  as on Windows XP

``IOLoop`` and ``IOStream``
~~~~~~~~~~~~~~~~~~~~~~~~~~~

* `~tornado.iostream.IOStream` performance has been improved, especially for
  small synchronous requests.
* New methods `tornado.iostream.IOStream.read_until_close` and
  `tornado.iostream.IOStream.read_until_regex`.
* `IOStream.read_bytes` and `IOStream.read_until_close` now take a
  ``streaming_callback`` argument to return data as it is received rather
  than all at once.
* `IOLoop.add_timeout` now accepts `datetime.timedelta` objects in addition
  to absolute timestamps.
* `~tornado.ioloop.PeriodicCallback` now sticks to the specified period
  instead of creeping later due to accumulated errors.
* `tornado.ioloop.IOLoop` and `tornado.httpclient.HTTPClient` now have
  ``close()`` methods that should be used in applications that create
  and destroy many of these objects.
* `IOLoop.install` can now be used to use a custom subclass of IOLoop
  as the singleton without monkey-patching.
* `~tornado.iostream.IOStream` should now always call the close callback
  instead of the connect callback on a connection error.
* The `IOStream` close callback will no longer be called while there
  are pending read callbacks that can be satisfied with buffered data.

``tornado.simple_httpclient``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* Now supports client SSL certificates with the ``client_key`` and
  ``client_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
* The ``allow_nonstandard_methods`` flag on HTTP client requests now
  permits methods other than ``POST`` and ``PUT`` to contain bodies.
* Fixed file descriptor leaks and multiple callback invocations in
  `SimpleAsyncHTTPClient`
* No longer consumes extra connection resources when following redirects.
* Now works with buggy web servers that separate headers with ``\n`` instead
  of ``\r\n\r\n``.
* Now sets ``response.request_time`` correctly.
* Connect timeouts now work correctly.

Other modules
~~~~~~~~~~~~~

* `tornado.auth.OpenIDMixin` now uses the correct realm when the
  callback URI is on a different domain.
* `tornado.autoreload` has a new command-line interface which can be used
  to wrap any script.  This replaces the ``--autoreload`` argument to
  `tornado.testing.main` and is more robust against syntax errors.
* `tornado.autoreload.watch` can be used to watch files other than
  the sources of imported modules.
* `tornado.database.Connection` has new variants of ``execute`` and
  ``executemany`` that return the number of rows affected instead of
  the last inserted row id.
* `tornado.locale.load_translations` now accepts any properly-formatted
  locale name, not just those in the predefined ``LOCALE_NAMES`` list.
* `tornado.options.define` now takes a ``group`` parameter to group options
  in ``--help`` output.
* Template loaders now take a ``namespace`` constructor argument to add
  entries to the template namespace.
* `tornado.websocket` now supports the latest ("hybi-10") version of the
  protocol (the old version, "hixie-76" is still supported; the correct
  version is detected automatically).
* `tornado.websocket` now works on Python 3

Bug fixes
~~~~~~~~~

* Windows support has been improved.  Windows is still not an officially
  supported platform, but the test suite now passes and
  `tornado.autoreload` works.
* Uploading files whose names contain special characters will now work.
* Cookie values containing special characters are now properly quoted
  and 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 applications
  use a template variable named ``modules``.
* Requests with "Expect: 100-continue" now work on python 3

v2.0.0

Major changes:
* Template output is automatically escaped by default; see backwards
  compatibility note below.
* The default AsyncHTTPClient implementation is now simple_httpclient.
* Python 3.2 is now supported.

Backwards compatibility:
* Template autoescaping is enabled by default.  Applications upgrading from
  a previous release of Tornado must either disable autoescaping or adapt
  their templates to work with it.  For most applications, the simplest
  way to do this is to pass autoescape=None to the Application constructor.
* Applications that wish to continue using curl_httpclient instead of
  simple_httpclient may do so by calling
    AsyncHTTPClient.configure("tornado.curl_httpclient.CurlAsyncHTTPClient")
  at the beginning of the process.  Users of Python 2.5 will probably want
  to use curl_httpclient as simple_httpclient only supports ssl on Python 2.6+.
* Python 3 compatibility involved many changes throughout the codebase,
  so users are encouraged to test their applications more thoroughly than
  usual when upgrading to this release.

Other changes in this release:
* Templates support several new directives:
  - {% autoescape ...%} to control escaping behavior
  - {% raw ... %} for unescaped output
  - {% module ... %} for calling UIModules
* {% module Template(path, **kwargs) %} may now be used to call another
  template with an independent namespace
* All IOStream callbacks are now run directly on the IOLoop via add_callback.
* HTTPServer now supports IPv6 where available.  To disable, pass
  family=socket.AF_INET to HTTPServer.bind().
* HTTPClient now supports IPv6, configurable via allow_ipv6=bool on the
  HTTPRequest.  allow_ipv6 defaults to false on simple_httpclient and true
  on curl_httpclient.
* RequestHandlers can use an encoding other than utf-8 for query parameters
  by overriding decode_argument()
* Performance improvements, especially for applications that use a lot of
  IOLoop timeouts
* HTTP OPTIONS method no longer requires an XSRF token.
* JSON output (RequestHandler.write(dict)) now sets Content-Type to
  application/json
* Etag computation can now be customized or disabled by overriding
  RequestHandler.compute_etag
* USE_SIMPLE_HTTPCLIENT environment variable is no longer supported.
  Use AsyncHTTPClient.configure instead.

v1.2.1

We are pleased to announce the release of Tornado 1.2.1, available from

http://github.com/downloads/facebook/tornado/tornado-1.2.1.tar.gz

This release contains only two small changes relative to version 1.2:
* FacebookGraphMixin has been updated to work with a recent change to the
  Facebook API.
* Running "setup.py install" will no longer attempt to automatically
  install pycurl.  This wasn't working well on platforms where the best way
  to install pycurl is via something like apt-get instead of easy_install.

This is an important upgrade if you are using FacebookGraphMixin, but
otherwise it can be safely ignored.

-Ben

v1.2.0

We are pleased to announce the release of Tornado 1.2, available from

http://github.com/downloads/facebook/tornado/tornado-1.2.tar.gz

Backwards compatibility notes:
* This release includes the backwards-incompatible security change from
  version 1.1.1.  Users upgrading from 1.1 or earlier should read the
  release notes from that release:
  http://groups.google.com/group/python-tornado/browse_thread/thread/b36191c781580cde
* StackContexts that do something other than catch exceptions may need to
  be modified to be reentrant.
  tornadoweb@7a7e241
* When XSRF tokens are used, the token must also be present on PUT and
  DELETE requests (anything but GET and HEAD)

New features:
* A new HTTP client implementation is available in the module
  tornado.simple_httpclient.  This HTTP client does not depend on pycurl.
  It has not yet been tested extensively in production, but is intended
  to eventually replace the pycurl-based HTTP client in a future release of
  Tornado.  To transparently replace tornado.httpclient.AsyncHTTPClient with
  this new implementation, you can set the environment variable
  USE_SIMPLE_HTTPCLIENT=1 (note that the next release of Tornado will
  likely include a different way to select HTTP client implementations)
* Request logging is now done by the Application rather than the
  RequestHandler.  Logging behavior may be customized by either overriding
  Application.log_request in a subclass or by passing log_function
  as an Application setting
* Application.listen(port): Convenience method as an alternative to
  explicitly creating an HTTPServer
* tornado.escape.linkify(): Wrap urls in <a> tags
* RequestHandler.create_signed_value(): Create signatures like the
  secure_cookie methods without setting cookies.
* tornado.testing.get_unused_port(): Returns a port selected in the same
  way as inAsyncHTTPTestCase
* AsyncHTTPTestCase.fetch(): Convenience method for synchronous fetches
* IOLoop.set_blocking_signal_threshold(): Set a callback to be run when
  the IOLoop is blocked.
* IOStream.connect(): Asynchronously connect a client socket
* AsyncHTTPClient.handle_callback_exception(): May be overridden
  in subclass for custom error handling
* httpclient.HTTPRequest has two new keyword arguments, validate_cert and
  ca_certs. Setting validate_cert=False will disable all certificate checks
  when fetching https urls.  ca_certs may be set to a filename containing
  trusted certificate authorities (defaults will be used if this is
  unspecified)
* HTTPRequest.get_ssl_certificate(): Returns the client's SSL certificate
  (if client certificates were requested in the server's ssl_options
* StaticFileHandler can be configured to return a default file (e.g.
  index.html) when a directory is requested
* Template directives of the form "{% from x import y %}" are now supported (in
  addition to the existing support for "{% import x %}"
* FacebookGraphMixin.get_authenticated_user now accepts a new
  parameter 'extra_fields' which may be used to request additional information
  about the user

Bug fixes:
* auth: Fixed KeyError with Facebook offline_access
* auth: Uses request.uri instead of request.path as the default redirect
  so that parameters are preserved.
* escape: xhtml_escape() now returns a unicode string, not utf8-encoded bytes
* ioloop: Callbacks added with add_callback are now run in the order they
  were added
* ioloop: PeriodicCallback.stop can now be called from inside the callback.
* iostream: Fixed several bugs in SSLIOStream
* iostream: Detect when the other side has closed the connection even with
  the select()-based IOLoop
* iostream: read_bytes(0) now works as expected
* iostream: Fixed bug when writing large amounts of data on windows
* iostream: Fixed infinite loop that could occur with unhandled exceptions
* httpclient: Fix bugs when some requests use proxies and others don't
* httpserver: HTTPRequest.protocol is now set correctly when using the
  built-in SSL support
* httpserver: When using multiple processes, the standard library's
  random number generator is re-seeded in each child process
* httpserver: With xheaders enabled, X-Forwarded-Proto is supported as an
  alternative to X-Scheme
* httpserver: Fixed bugs in multipart/form-data parsing
* locale: format_date() now behaves sanely with dates in the future
* locale: Updates to the language list
* stack_context: Fixed bug with contexts leaking through reused IOStreams
* stack_context: Simplified semantics and improved performance
* web: The order of css_files from UIModules is now preserved
* web: Fixed error with default_host redirect
* web: StaticFileHandler works when os.path.sep != '/' (i.e. on Windows)
* web: Fixed a caching-related bug in StaticFileHandler when a file's
  timestamp has changed but its contents have not.
* web: Fixed bugs with HEAD requests and e.g. Etag headers
* web: Fix bugs when different handlers have different static_paths
* web: @removeslash will no longer cause a redirect loop when applied to the
  root path
* websocket: Now works over SSL
* websocket: Improved compatibility with proxies

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

-Ben

v1.1.1

Tornado 1.1.1 is a BACKWARDS-INCOMPATIBLE security update that fixes an
XSRF vulnerability.  It is available at
http://github.com/downloads/facebook/tornado/tornado-1.1.1.tar.gz

This is a backwards-incompatible change.  Applications that previously
relied on a blanket exception for XMLHTTPRequest may need to be modified
to explicitly include the XSRF token when making ajax requests.

The tornado chat demo application demonstrates one way of adding this
token (specifically the function postJSON in demos/chat/static/chat.js).

More information about this change and its justification can be found at
http://www.djangoproject.com/weblog/2011/feb/08/security/
http://weblog.rubyonrails.org/2011/2/8/csrf-protection-bypass-in-ruby-on-rails

v1.1.0

We are pleased to announce the release of Tornado 1.1, available from

http://github.com/downloads/facebook/tornado/tornado-1.1.tar.gz

Changes in this release:
* RequestHandler.async_callback and related functions in other classes
  are no longer needed in most cases (although it's harmless to continue
  using them).  Uncaught exceptions will now cause the request to be closed
  even in a callback.  If you're curious how this works, see the new
  tornado.stack_context module.
* The new tornado.testing module contains support for unit testing
  asynchronous IOLoop-based code.
* AsyncHTTPClient has been rewritten (the new implementation was available as
  AsyncHTTPClient2 in Tornado 1.0; both names are supported for backwards
  compatibility).
* The tornado.auth module has had a number of updates, including support
  for OAuth 2.0 and the Facebook Graph API, and upgrading Twitter and
  Google support to OAuth 1.0a.
* The websocket module is back and supports the latest version (76) of the
  websocket protocol.  Note that this module's interface is different
  from the websocket module that appeared in pre-1.0 versions of Tornado.
* New method RequestHandler.initialize() can be overridden in subclasses
  to simplify handling arguments from URLSpecs.  The sequence of methods
  called during initialization is documented at
  http://tornadoweb.org/documentation#overriding-requesthandler-methods
* get_argument() and related methods now work on PUT requests in addition
  to POST.
* The httpclient module now supports HTTP proxies.
* When HTTPServer is run in SSL mode, the SSL handshake is now non-blocking.
* Many smaller bug fixes and documentation updates

Backwards-compatibility notes:
* While most users of Tornado should not have to deal with the stack_context
  module directly, users of worker thread pools and similar constructs may
  need to use stack_context.wrap and/or NullContext to avoid memory leaks.
* The new AsyncHTTPClient still works with libcurl version 7.16.x, but it
  performs better when both libcurl and pycurl are at least version 7.18.2.
* OAuth transactions started under previous versions of the auth module
  cannot be completed under the new module.  This applies only to the
  initial authorization process; once an authorized token is issued that
  token works with either version.

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

-Ben

v1.0.1

This release fixes a bug with RequestHandler.get_secure_cookie, which…
… would

in some circumstances allow an attacker to tamper with data stored in the
cookie.

v1.0.0

We are pleased to announce the release of Tornado 1.0, available from h…
…ttp://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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