Plack (software)

Plack is a set of tools for Perl programming of Web applications and running frameworks compatible with the PSGI specification, such as Catalyst and Dancer.

Plack was inspired by Rack for Ruby and WSGI for Python.^[1]

Plackup is a command-line tool for running the PSGI applications,

Supported backends

As of March 2010^[2] Plack supports the following server backends:

• CGI
• SCGI
• FastCGI
• mod_perl under Apache 1.3 and 2.0
• Standalone HTTP server included in Plack
• HTTP::Server::Simple
• Corona
• Starman
• Twiggy
• AnyEvent::HTTPD
• AnyEvent::ReverseHTTP

Examples

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!

References

1. ↑ http://plackperl.org
2. ↑ Plack::Handler modules on CPAN

External links

• PSGI and Plack website
• Plack documentation
• plackup manual