Plack::App::Proxy3pm

Usage

  use Plack::Builder;
  # proxy all requests for /static to 127.0.0.1:80
  builder {
      mount "/static" => Plack::App::Proxy->new(remote => "http://127.0.0.1:80")->to_app;
  };
  # Call from other app
  my $proxy = Plack::App::Proxy->new->to_app;
  my $app = sub {
      my $env = shift;
      ...
      $env->{'plack.proxy.url'} = $url;
      $proxy->($env);
  };

Overview

Plack::App::Proxy is a middleware-aware proxy application for Plack.

Options

remote

  Plack::App::Proxy->new(remote => 'http://perl.org')->to_app;

Specifies the base remote URL to proxy requests to.

  builder {
      mount "/example",
          Plack::App::Proxy->new(remote => 'http://example.com/app/foo')->to_app;
  };

This proxies incoming requests for "/example/bar" proxied to "http://example.com/app/foo/bar".

preserve_host_header

Preserves the original Host header, which is useful when you do reverse proxying to the internal hosts.

backend

The HTTP backend to use. This dist comes with "LWP" and "AnyEvent::HTTP" backends. "AnyEvent::HTTP" is the default if no backend is specified.

options

The options for the HTTP backend instance.

Middleware configurations

This application is just like a normal PSGI application and is middleware aware, which means you can modify proxy requests (and responses) using Plack middleware stack.

It also supports the following special environment variables:

For example, the following builder code allows you to proxy all GET requests for .png paths to the lolcat image (yes, a silly example) but proxies to the internal host otherwise.

  my $mw = sub {
      my $app = shift;
      sub {
          my $env = shift;
          if ($env->{REQUEST_METHOD} eq 'GET' && $env->{PATH_INFO} =~ /\.png$/) {
              $env->{'plack.proxy.url'} = 'http://lolcat.example.com/lol.png';
          }
          $app->($env);
      };
  };
  use Plack::Builder;
  builder {
      enable $mw;
      Plack::App::Proxy->new(remote => 'http://10.0.0.1:8080')->to_app;
  };