Plack (software)

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Original author(s) Tatsuhiko Miyagawa
Developer(s) Tatsuhiko Miyagawa, Tokuhiro Matsuno, Jesse Luehrs, Tomas Doran, Graham Knop and others.
Written in Perl
License Perl License (Artistic License v2 + GNU General Public License v1)
An example of server-side scripting using Perl, Plack and PSGI.

Plack is a Perl web application programming framework inspired by Rack for Ruby and WSGI for Python,[1] and it is the project behind the PSGI specification used by other frameworks such as Catalyst and Dancer.

Plackup is a command line utility to run PSGI applications from the command line.[2]

Supported backends

As of March 2010[3] Plack supports the following server backends:


Using the default standalone HTTP server:

$ plackup app.psgi
HTTP::Server::PSGI: Accepting connections at http://0:5000/

Running as a FastCGI daemon listening on a Unix socket, ready to be used by any Web server with FastCGI support:

$ plackup -s FCGI -listen /tmp/fcgi.sock app.psgi
FastCGI: manager (pid 3336): initialized
FastCGI: manager (pid 3336): server (pid 3337) started
FastCGI: server (pid 3337): initialized

A working Hello world application run as a one-liner:

$ plackup -e 'sub { [200, ["Content-Type" => "text/plain"], ["Hello, world!"]] }'
HTTP::Server::PSGI: Accepting connections at http://0:5000/

The command above starts an HTTP server listening on port 5000 of every local interface (IP address) and returns this 200 OK response to every HTTP request:

HTTP/1.0 200 OK
Date: Fri, 19 Mar 2010 23:34:10 GMT
Server: HTTP::Server::PSGI
Content-Type: text/plain
Content-Length: 13
Hello, world!


  1. ^
  2. ^ "plackup -". Retrieved 2016-02-20.
  3. ^ Plack::Handler modules on CPAN

External links