NAME
    Plack::App::Proxy - proxy requests

SYNOPSIS
      use Plack::Builder;
      use Plack::App::Proxy;

      # 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);
      };

DESCRIPTION
    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:

    plack.proxy.url
        Overrides the proxy request URL.

    plack.proxy.remote
        Overrides the base URL path to proxy to.

    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;
      };

AUTHOR
    Lee Aylward

    Masahiro Honma

    Tatsuhiko Miyagawa

    Jesse Luehrs

LICENSE
    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.

SEE ALSO
    Plack::Builder