in reply to using a 'here' doc to build a web page
What framework are you using? Mojolicious::Lite has a nice templating system by default (see this tutorial), other templating systems are optional, and a logical path for growth.
Are you using CGI? Even that will likely be better (safer) than something hand rolled. I'd suggest that you start off with Mojolicious::Lite, the documentation is great.
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