In httpd.conf ProxyPass /foo http://127.0.0.1:5001 ProxyPassReverse /foo http://127.0.0.1:5001 and foo.psgi file like so use Dancer ':syntax'; use Plack::Builder; setting apphandler => 'PSGI'; my $app = sub { my $env = shift; local $ENV{DANCER_APPDIR} = "/Users/punkish/Documents/www/foo"; setting appdir => "/Users/punkish/Documents/www/foo"; load_app "foo"; Dancer::App->set_running_app("foo"); Dancer::Config->load; my $request = Dancer::Request->new( env => $env ); Dancer->dance( $request ); }; builder { enable "Static", path => sub { s!^/lib/!! }, root => "/Users/punkish/Sites/lib"; mount "/" => builder {$app}; }; I start the above with $plackup -E development -s Starman --workers=10 -p 5000 -a foo.psgi The above works fine if I go to http://localhost.local/foo/, but if I go to http://localhost.local/foo (no trailing slash), all the resources at /lib are unreachable. But, here is a more confounding problem; to access the above as an apache virtual host, I change httpd.conf to <VirtualHost foo.local:80> ProxyPass / http://127.0.0.1:5001/ ProxyPassReverse / http://127.0.0.1:5001/ </VirtualHost> and change only the following line in foo.psgi to - mount "/" => builder {$app}; + mount "http://foo.local" => builder {$app}; But, now I get the following error Error while loading foo.psgi: Paths need to start with / at /Users/punkish/perl5/perlbrew/perls/perl-5.14.1/lib/site_perl/5.14.1/Plack/Builder.pm line 89