NAME
   Plack - Perl Superglue for Web frameworks and Web Servers (PSGI toolkit)

DESCRIPTION
   Plack is a set of tools for using the PSGI stack. It contains middleware
   components, a reference server and utilities for Web application
   frameworks. Plack is like Ruby's Rack or Python's Paste for WSGI.

   See PSGI for the PSGI specification and PSGI::FAQ to know what PSGI and
   Plack are and why we need them.

MODULES AND UTILITIES
 Plack::Handler
   Plack::Handler and its subclasses contains adapters for web servers. We
   have adapters for the built-in standalone web server HTTP::Server::PSGI,
   CGI, FCGI, Apache1, Apache2 and HTTP::Server::Simple included in the
   core Plack distribution.

   There are also many HTTP server implementations on CPAN that have Plack
   handlers.

   See Plack::Handler when writing your own adapters.

 Plack::Loader
   Plack::Loader is a loader to load one Plack::Handler adapter and run a
   PSGI application code reference with it.

 Plack::Util
   Plack::Util contains a lot of utility functions for server implementors
   as well as middleware authors.

 .psgi files
   A PSGI application is a code reference but it's not easy to pass code
   reference via the command line or configuration files, so Plack uses a
   convention that you need a file named "app.psgi" or similar, which would
   be loaded (via perl's core function "do") to return the PSGI application
   code reference.

     # Hello.psgi
     my $app = sub {
         my $env = shift;
         # ...
         return [ $status, $headers, $body ];
     };

   If you use a web framework, chances are that they provide a helper
   utility to automatically generate these ".psgi" files for you, such as:

     # MyApp.psgi
     use MyApp;
     my $app = sub { MyApp->run_psgi(@_) };

   It's important that the return value of ".psgi" file is the code
   reference. See "eg/dot-psgi" directory for more examples of ".psgi"
   files.

 plackup, Plack::Runner
   plackup is a command line launcher to run PSGI applications from command
   line using Plack::Loader to load PSGI backends. It can be used to run
   standalone servers and FastCGI daemon processes. Other server backends
   like Apache2 needs a separate configuration but ".psgi" application file
   can still be the same.

   If you want to write your own frontend that replaces, or adds
   functionalities to plackup, take a look at the Plack::Runner module.

 Plack::Middleware
   PSGI middleware is a PSGI application that wraps an existing PSGI
   application and plays both side of application and servers. From the
   servers the wrapped code reference still looks like and behaves exactly
   the same as PSGI applications.

   Plack::Middleware gives you an easy way to wrap PSGI applications with a
   clean API, and compatibility with Plack::Builder DSL.

 Plack::Builder
   Plack::Builder gives you a DSL that you can enable Middleware in ".psgi"
   files to wrap existent PSGI applications.

 Plack::Request, Plack::Response
   Plack::Request gives you a nice wrapper API around PSGI $env hash to get
   headers, cookies and query parameters much like Apache::Request in
   mod_perl.

   Plack::Response does the same to construct the response array reference.

 Plack::Test
   Plack::Test is a unified interface to test your PSGI application using
   standard HTTP::Request and HTTP::Response pair with simple callbacks.

 Plack::Test::Suite
   Plack::Test::Suite is a test suite to test a new PSGI server backend.

CONTRIBUTING
 Patches and Bug Fixes
   Small patches and bug fixes can be either submitted via nopaste on IRC
   <irc://irc.perl.org/#plack> or the github issue tracker
   <http://github.com/plack/Plack/issues>. Forking on github
   <http://github.com/plack/Plack> is another good way if you intend to
   make larger fixes.

   See also <http://contributing.appspot.com/plack> when you think this
   document is terribly outdated.

 Module Namespaces
   Modules added to the Plack:: sub-namespaces should be reasonably generic
   components which are useful as building blocks and not just simply using
   Plack.

   Middleware authors are free to use the Plack::Middleware:: namespace for
   their middleware components. Middleware must be written in the pipeline
   style such that they can chained together with other middleware
   components. The Plack::Middleware:: modules in the core distribution are
   good examples of such modules. It is recommended that you inherit from
   Plack::Middleware for these types of modules.

   Not all middleware components are wrappers, but instead are more like
   endpoints in a middleware chain. These types of components should use
   the Plack::App:: namespace. Again, look in the core modules to see
   excellent examples of these (Plack::App::File, Plack::App::Directory,
   etc.). It is recommended that you inherit from Plack::Component for
   these types of modules.

   DO NOT USE Plack:: namespace to build a new web application or a
   framework. It's like naming your application under CGI:: namespace if
   it's supposed to run on CGI and that is a really bad choice and would
   confuse people badly.

AUTHOR
   Tatsuhiko Miyagawa

COPYRIGHT
   The following copyright notice applies to all the files provided in this
   distribution, including binary files, unless explicitly noted otherwise.

   Copyright 2009-2011 Tatsuhiko Miyagawa

CORE DEVELOPERS
   Tatsuhiko Miyagawa (miyagawa)

   Tokuhiro Matsuno (tokuhirom)

   Jesse Luehrs (doy)

   Tomas Doran (bobtfish)

   Graham Knop (haarg)

CONTRIBUTORS
   Yuval Kogman (nothingmuch)

   Kazuhiro Osawa (Yappo)

   Kazuho Oku

   Florian Ragwitz (rafl)

   Chia-liang Kao (clkao)

   Masahiro Honma (hiratara)

   Daisuke Murase (typester)

   John Beppu

   Matt S Trout (mst)

   Shawn M Moore (Sartak)

   Stevan Little

   Hans Dieter Pearcey (confound)

   mala

   Mark Stosberg

   Aaron Trevena

SEE ALSO
   The PSGI specification upon which Plack is based.

   <http://plackperl.org/>

   The Plack wiki: <https://github.com/plack/Plack/wiki>

   The Plack FAQ: <https://github.com/plack/Plack/wiki/Faq>

LICENSE
   This library is free software; you can redistribute it and/or modify it
   under the same terms as Perl itself.

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