Catalyst::Engine::PSGI(3pm)

Usage

  # app.psgi
  use strict;
  use MyApp;
  MyApp->setup_engine('PSGI');
  my $app = sub { MyApp->run(@_) };

Overview

Catalyst::Engine::PSGI is a Catalyst Engine that adapts Catalyst into the PSGI gateway protocol.

Compatibility

•: Currently this engine works with Catalyst 5.8 (Catamoose) or newer.

•

Your application is supposed to work with any PSGI servers without any code modifications, but if your application uses "$c->res->write" to do streaming write, this engine will buffer the output until your app finishes.

To do real streaming with this engine, you should implement an IO::Handle-like object that responds to "getline" method that returns chunk or undef when done, and set that object to "$c->res->body".

Alternatively, it is possible to set the body to a code reference, which will be used to stream content as documented in the PSGI spec.

•

When your application runs behind the frontend proxy like nginx or lighttpd, this Catalyst engine doesn't automatically recognize the incoming headers like "X-Forwarded-For", because respecting these headers by default causes a potential security issue.

You have to enable Plack::Middleware::ReverseProxy or Plack::Middleware::ForwardedHeaders to automatically promote those forwarded headers into "REMOTE_ADDR" hence IP address of the request.

ReverseProxy middleware is pretty simple and has no configuration while ForwardedHeaders allows you to configure which upstream host to trust, etc.