Thank you for suggesting this link. I copied a part of the Perl Advent tutorial below,

"PSGI middleware behaves like a normal PSGI application but wraps the original PSGI application…”

Based on this, a middleware behaves like a normal PSGI application. This means that I could also treat a middleware like a regular PSGI application and map a URL to it, using Plack::App::URLMap, just like any regular PSGI application. I guess, what I did above to run my middleware $form_validator is acceptable.

In reply to Re^4: Is it required to map a Plack/PSGI middleware? by tiny_monk
in thread Is it required to map a Plack/PSGI middleware? by tiny_monk

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