PSGI
PSGI or Perl Web Server Gateway Interface is an interface between web servers and Perl-based web applications and frameworks that allows writing portable applications that can be run as standalone servers or using CGI, FastCGI, mod_perl, et al. It is inspired by the Web Server Gateway Interface for Python, Rack for Ruby and JSGI for JavaScript.
A PSGI application is a Perl subroutine that accepts arguments as a single hash reference and returns a reference to an array of three elements: an HTTP status code, a reference to an array of HTTP headers and a reference to an array of HTTP body lines (usually a generated HTML document) or a filehandle-like object.
Plack is a reference PSGI implementation.
Web frameworks with PSGI support:
- Catalyst
- CGI::Application
- Continuity
- Dancer
- HTTP::Engine
- Leyland
- Mason
- Maypole
- McBain
- Mojolicious
- Piglet
- Squatting
- Tatsumaki
Example Application
This is an example hello world PSGI application:
my $app = sub {
return [200, ['Content-Type' => 'text/plain'], ["hello, world\n"]];
}
Save this file as hello.psgi and run it from the command-line: plackup hello.psgi
Web hosting with support for standard PSGI
External links
- Plack and PSGI, various links to servers and frameworks
- PSGI - Perl Web Server Gateway Interface Specification
- article on Plack and nginx from Catalyzed.org
- Plack Advent calendar
- Plack coverage, Catalyst Advent calendar