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tomorrow's article.</p>
<h2><a name="new_features"></a>New Features</h2>

<p>Several significant new features came to pass since the last Advent Calendar:</p>
<h3><a name="websockets"></a>Websockets</h3>

<p>You asked, and Yanick delivered! <a href="https://metacpan.org/pod/Dancer2::Plugin::WebSocket">Dancer2::Plugin::Websocket</a>
enables websockets from within your Dancer2 applications. To make this work
properly, a non-blocking, streaming Plack server is needed (such as Twiggy).</p>
<h3><a name="mutable_serializer"></a>Mutable Serializer</h3>

<p>Dancer2 can now properly deserialize and serialize content based upon the 
request headers. Even better, it's completely and easily configurable! Thanks
to veryrusty for spearheading the effort to get this working!</p>
<h3><a name="no_default_middleware"></a>No Default Middleware</h3>

<p>To support ETags and other similar features, the default Plack middleware used
by Dancer2 can get in the way. To get around this, veryrusty added a 
<code>no_default_middleware</code> configuration option to Dancer2's <i>config.yml</i> file
to keep your application from using the default bundling of Plack middleware.</p>
<h2><a name="better_documentation"></a>Better Documentation</h2>

<p>Several dozen bug fixes, clarifications, and other enhancements have been made
to the documentation, primarily by the Dancer2 community. As a result, the 
quality of existing docs has been greatly improved.</p>
<p>Several new examples have been added to both the Dancer2 distribution as well
as the tutorial.</p>
<p>Sawyer has started a significant project to rebuild the Dancer2 documentation 
from scratch. The current docs lack a good description of why Dancer does 
things a certain way, and doesn't give new users a good grounding in web 
application design to know how and why some things should be done the way
we've recommended. The new doc project aims to address this by detailing 
important concepts in a clear and simple way.</p>
<h2><a name="performance_improvements"></a>Performance Improvements</h2>

<p>Several important performance improvements were made to Dancer2, the most
important of which being the migration from <code>MooX::Types</code> to <code>Type::Tiny</code>. 
When <code>Type::Tiny::XS</code> is used, the boost is even more significant.</p>
<h2><a name="security_improvements"></a>Security Improvements</h2>

<p>Two important security features were added:</p>
<p>The session engine now requires a <code>validate_id()</code> method to be implemented in
the various session engines. This requirement shuts down an attack vector by
making session IDs conform to a known format.</p>
<p>SysPete implemented a <code>change_session_id</code> keyword to easily change the 
current session ID. This is a common (and recommended) security practice,
especially when privilege level changes within an application.</p>
<h2><a name="author"></a>Author</h2>

<p>This article has been written by Jason Crome (CromeDome) for the Perl Dancer 
Advent Calendar 2018.</p>
<h2><a name="copyright"></a>Copyright</h2>

<p>No copyright retained. Enjoy.</p>
<p>Jason A. Crome</p>
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