perldoc-server with plack

app.psgi

#!/usr/bin/env perl

use strict;
use warnings;

use Perldoc::Server;
use Plack::Builder;

my $app = Perldoc::Server->psgi_app(@_);

builder {
    enable_if {
        $_[0]->{REMOTE_ADDR} eq '127.0.0.1'
    } "Plack::Middleware::ReverseProxy";

    $app;
};