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<div class="section" id="what-s-new-in-tornado-2-3">
<h1>What’s new in Tornado 2.3<a class="headerlink" href="#what-s-new-in-tornado-2-3" title="Permalink to this headline">¶</a></h1>
<div class="section" id="may-31-2012">
<h2>May 31, 2012<a class="headerlink" href="#may-31-2012" title="Permalink to this headline">¶</a></h2>
<div class="section" id="http-clients">
<h3>HTTP clients<a class="headerlink" href="#http-clients" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li><a class="reference internal" href="../httpclient.html#tornado.httpclient.HTTPClient" title="tornado.httpclient.HTTPClient"><code class="xref py py-obj docutils literal"><span class="pre">tornado.httpclient.HTTPClient</span></code></a> now supports the same constructor
keyword arguments as <a class="reference internal" href="../httpclient.html#tornado.httpclient.AsyncHTTPClient" title="tornado.httpclient.AsyncHTTPClient"><code class="xref py py-obj docutils literal"><span class="pre">AsyncHTTPClient</span></code></a>.</li>
<li>The <code class="docutils literal"><span class="pre">max_clients</span></code> keyword argument to <a class="reference internal" href="../httpclient.html#tornado.httpclient.AsyncHTTPClient.configure" title="tornado.httpclient.AsyncHTTPClient.configure"><code class="xref py py-obj docutils literal"><span class="pre">AsyncHTTPClient.configure</span></code></a> now works.</li>
<li><code class="docutils literal"><span class="pre">tornado.simple_httpclient</span></code> now supports the <code class="docutils literal"><span class="pre">OPTIONS</span></code> and <code class="docutils literal"><span class="pre">PATCH</span></code>
HTTP methods.</li>
<li><code class="docutils literal"><span class="pre">tornado.simple_httpclient</span></code> is better about closing its sockets
instead of leaving them for garbage collection.</li>
<li><code class="docutils literal"><span class="pre">tornado.simple_httpclient</span></code> correctly verifies SSL certificates for
URLs containing IPv6 literals (This bug affected Python 2.5 and 2.6).</li>
<li><code class="docutils literal"><span class="pre">tornado.simple_httpclient</span></code> no longer includes basic auth credentials
in the <code class="docutils literal"><span class="pre">Host</span></code> header when those credentials are extracted from the URL.</li>
<li><code class="docutils literal"><span class="pre">tornado.simple_httpclient</span></code> no longer modifies the caller-supplied header
dictionary, which caused problems when following redirects.</li>
<li><code class="docutils literal"><span class="pre">tornado.curl_httpclient</span></code> now supports client SSL certificates (using
the same <code class="docutils literal"><span class="pre">client_cert</span></code> and <code class="docutils literal"><span class="pre">client_key</span></code> arguments as
<code class="docutils literal"><span class="pre">tornado.simple_httpclient</span></code>)</li>
</ul>
</div>
<div class="section" id="http-server">
<h3>HTTP Server<a class="headerlink" href="#http-server" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li><a class="reference internal" href="../httpserver.html#tornado.httpserver.HTTPServer" title="tornado.httpserver.HTTPServer"><code class="xref py py-obj docutils literal"><span class="pre">HTTPServer</span></code></a> now works correctly with paths starting with <code class="docutils literal"><span class="pre">//</span></code></li>
<li><code class="docutils literal"><span class="pre">HTTPHeaders.copy</span></code> (inherited from <a class="reference external" href="/usr/share/doc/python3-doc/html/library/stdtypes.html#dict.copy" title="(in Python v3.5)"><code class="xref py py-obj docutils literal"><span class="pre">dict.copy</span></code></a>) now works correctly.</li>
<li><code class="docutils literal"><span class="pre">HTTPConnection.address</span></code> is now always the socket address, even for non-IP
sockets. <code class="docutils literal"><span class="pre">HTTPRequest.remote_ip</span></code> is still always an IP-style address
(fake data is used for non-IP sockets)</li>
<li>Extra data at the end of multipart form bodies is now ignored, which fixes
a compatibility problem with an iOS HTTP client library.</li>
</ul>
</div>
<div class="section" id="ioloop-and-iostream">
<h3><code class="docutils literal"><span class="pre">IOLoop</span></code> and <code class="docutils literal"><span class="pre">IOStream</span></code><a class="headerlink" href="#ioloop-and-iostream" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li><a class="reference internal" href="../iostream.html#tornado.iostream.IOStream" title="tornado.iostream.IOStream"><code class="xref py py-obj docutils literal"><span class="pre">IOStream</span></code></a> now has an <code class="docutils literal"><span class="pre">error</span></code> attribute that can be used to determine
why a socket was closed.</li>
<li><code class="docutils literal"><span class="pre">tornado.iostream.IOStream.read_until</span></code> and <code class="docutils literal"><span class="pre">read_until_regex</span></code> are much
faster with large input.</li>
<li><code class="docutils literal"><span class="pre">IOStream.write</span></code> performs better when given very large strings.</li>
<li><a class="reference internal" href="../ioloop.html#tornado.ioloop.IOLoop.instance" title="tornado.ioloop.IOLoop.instance"><code class="xref py py-obj docutils literal"><span class="pre">IOLoop.instance()</span></code></a> is now thread-safe.</li>
</ul>
</div>
<div class="section" id="tornado-options">
<h3><code class="docutils literal"><span class="pre">tornado.options</span></code><a class="headerlink" href="#tornado-options" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li><a class="reference internal" href="../options.html#module-tornado.options" title="tornado.options"><code class="xref py py-obj docutils literal"><span class="pre">tornado.options</span></code></a> options with <code class="docutils literal"><span class="pre">multiple=True</span></code> that are set more than
once now overwrite rather than append. This makes it possible to override
values set in <code class="docutils literal"><span class="pre">parse_config_file</span></code> with <code class="docutils literal"><span class="pre">parse_command_line</span></code>.</li>
<li><a class="reference internal" href="../options.html#module-tornado.options" title="tornado.options"><code class="xref py py-obj docutils literal"><span class="pre">tornado.options</span></code></a> <code class="docutils literal"><span class="pre">--help</span></code> output is now prettier.</li>
<li><a class="reference internal" href="../options.html#tornado.options.options" title="tornado.options.options"><code class="xref py py-obj docutils literal"><span class="pre">tornado.options.options</span></code></a> now supports attribute assignment.</li>
</ul>
</div>
<div class="section" id="tornado-template">
<h3><code class="docutils literal"><span class="pre">tornado.template</span></code><a class="headerlink" href="#tornado-template" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li>Template files containing non-ASCII (utf8) characters now work on Python 3
regardless of the locale environment variables.</li>
<li>Templates now support <code class="docutils literal"><span class="pre">else</span></code> clauses in
<code class="docutils literal"><span class="pre">try</span></code>/<code class="docutils literal"><span class="pre">except</span></code>/<code class="docutils literal"><span class="pre">finally</span></code>/<code class="docutils literal"><span class="pre">else</span></code> blocks.</li>
</ul>
</div>
<div class="section" id="tornado-web">
<h3><code class="docutils literal"><span class="pre">tornado.web</span></code><a class="headerlink" href="#tornado-web" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li><a class="reference internal" href="../web.html#tornado.web.RequestHandler" title="tornado.web.RequestHandler"><code class="xref py py-obj docutils literal"><span class="pre">tornado.web.RequestHandler</span></code></a> now supports the <code class="docutils literal"><span class="pre">PATCH</span></code> HTTP method.
Note that this means any existing methods named <code class="docutils literal"><span class="pre">patch</span></code> in
<code class="docutils literal"><span class="pre">RequestHandler</span></code> subclasses will need to be renamed.</li>
<li><a class="reference internal" href="../web.html#tornado.web.addslash" title="tornado.web.addslash"><code class="xref py py-obj docutils literal"><span class="pre">tornado.web.addslash</span></code></a> and <code class="docutils literal"><span class="pre">removeslash</span></code> decorators now send permanent
redirects (301) instead of temporary (302).</li>
<li><a class="reference internal" href="../web.html#tornado.web.RequestHandler.flush" title="tornado.web.RequestHandler.flush"><code class="xref py py-obj docutils literal"><span class="pre">RequestHandler.flush</span></code></a> now invokes its callback whether there was any data
to flush or not.</li>
<li>Repeated calls to <a class="reference internal" href="../web.html#tornado.web.RequestHandler.set_cookie" title="tornado.web.RequestHandler.set_cookie"><code class="xref py py-obj docutils literal"><span class="pre">RequestHandler.set_cookie</span></code></a> with the same name now
overwrite the previous cookie instead of producing additional copies.</li>
<li><code class="docutils literal"><span class="pre">tornado.web.OutputTransform.transform_first_chunk</span></code> 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.</li>
<li>Fixed a bug on python versions before 2.6.5 when <a class="reference internal" href="../web.html#tornado.web.URLSpec" title="tornado.web.URLSpec"><code class="xref py py-obj docutils literal"><span class="pre">URLSpec</span></code></a> regexes
are constructed from unicode strings and keyword arguments are extracted.</li>
<li>The <code class="docutils literal"><span class="pre">reverse_url</span></code> function in the template namespace now comes from
the <a class="reference internal" href="../web.html#tornado.web.RequestHandler" title="tornado.web.RequestHandler"><code class="xref py py-obj docutils literal"><span class="pre">RequestHandler</span></code></a> rather than the <a class="reference internal" href="../web.html#tornado.web.Application" title="tornado.web.Application"><code class="xref py py-obj docutils literal"><span class="pre">Application</span></code></a>. (Unless overridden,
<a class="reference internal" href="../web.html#tornado.web.RequestHandler.reverse_url" title="tornado.web.RequestHandler.reverse_url"><code class="xref py py-obj docutils literal"><span class="pre">RequestHandler.reverse_url</span></code></a> is just an alias for the <a class="reference internal" href="../web.html#tornado.web.Application" title="tornado.web.Application"><code class="xref py py-obj docutils literal"><span class="pre">Application</span></code></a>
method).</li>
<li>The <code class="docutils literal"><span class="pre">Etag</span></code> header is now returned on 304 responses to an <code class="docutils literal"><span class="pre">If-None-Match</span></code>
request, improving compatibility with some caches.</li>
<li><a class="reference internal" href="../web.html#module-tornado.web" title="tornado.web"><code class="xref py py-obj docutils literal"><span class="pre">tornado.web</span></code></a> will no longer produce responses with status code 304
that also have entity headers such as <code class="docutils literal"><span class="pre">Content-Length</span></code>.</li>
</ul>
</div>
<div class="section" id="other-modules">
<h3>Other modules<a class="headerlink" href="#other-modules" title="Permalink to this headline">¶</a></h3>
<ul class="simple">
<li><a class="reference internal" href="../auth.html#tornado.auth.FacebookGraphMixin" title="tornado.auth.FacebookGraphMixin"><code class="xref py py-obj docutils literal"><span class="pre">tornado.auth.FacebookGraphMixin</span></code></a> no longer sends <code class="docutils literal"><span class="pre">post_args</span></code> redundantly
in the url.</li>
<li>The <code class="docutils literal"><span class="pre">extra_params</span></code> argument to <a class="reference internal" href="../escape.html#tornado.escape.linkify" title="tornado.escape.linkify"><code class="xref py py-obj docutils literal"><span class="pre">tornado.escape.linkify</span></code></a> may now be
a callable, to allow parameters to be chosen separately for each link.</li>
<li><a class="reference internal" href="../gen.html#module-tornado.gen" title="tornado.gen"><code class="xref py py-obj docutils literal"><span class="pre">tornado.gen</span></code></a> no longer leaks <code class="docutils literal"><span class="pre">StackContexts</span></code> when a <code class="docutils literal"><span class="pre">@gen.engine</span></code> wrapped
function is called repeatedly.</li>
<li><a class="reference internal" href="../locale.html#tornado.locale.get_supported_locales" title="tornado.locale.get_supported_locales"><code class="xref py py-obj docutils literal"><span class="pre">tornado.locale.get_supported_locales</span></code></a> no longer takes a meaningless
<code class="docutils literal"><span class="pre">cls</span></code> argument.</li>
<li><a class="reference internal" href="../stack_context.html#tornado.stack_context.StackContext" title="tornado.stack_context.StackContext"><code class="xref py py-obj docutils literal"><span class="pre">StackContext</span></code></a> instances now have a deactivation callback that can be
used to prevent further propagation.</li>
<li><a class="reference internal" href="../testing.html#tornado.testing.AsyncTestCase.wait" title="tornado.testing.AsyncTestCase.wait"><code class="xref py py-obj docutils literal"><span class="pre">tornado.testing.AsyncTestCase.wait</span></code></a> now resets its timeout on each call.</li>
<li><a class="reference internal" href="../wsgi.html#tornado.wsgi.WSGIApplication" title="tornado.wsgi.WSGIApplication"><code class="xref py py-obj docutils literal"><span class="pre">tornado.wsgi.WSGIApplication</span></code></a> now parses arguments correctly on Python 3.</li>
<li>Exception handling on Python 3 has been improved; previously some exceptions
such as <a class="reference external" href="/usr/share/doc/python3-doc/html/library/exceptions.html#UnicodeDecodeError" title="(in Python v3.5)"><code class="xref py py-obj docutils literal"><span class="pre">UnicodeDecodeError</span></code></a> would generate <code class="docutils literal"><span class="pre">TypeErrors</span></code></li>
</ul>
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