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=head1 DEBUGGING

You can set the environment variable C<PLACK_URLMAP_DEBUG> to see how
this application matches with the incoming request host names and
paths.

=head1 HOW THIS WORKS

This application works by I<fixing> C<SCRIPT_NAME> and C<PATH_INFO>
before dispatching the incoming request to the relocated
applications.

Say you have a Wiki application that takes C</index> and C</page/*>
and makes a PSGI application C<$wiki_app> out of it, using one of
supported web frameworks, you can put the whole application under
C</wiki> by:

  # MyWikiApp looks at PATH_INFO and handles /index and /page/*
  my $wiki_app = sub { MyWikiApp->run(@_) };