Indeed.

Depending on the deployment method, it may be possible to add a hook to
restart the app automatically on git push or similar perhaps.

Wouldn't work so well for someone SFTP'ing their app up of course :)
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I have just opened http://dancer.2.ai/perl connecting via SFP and using cyberduck (edit with) and added a yes
<li><font color=B8C76F> YOUR WEBSPACE IS READY yes </li>
http://dancer.2.ai/perl

without restarting anything it loads the new text but again this is fairly simple test app :) still from my tests it looks like you do not need a restart with Plack::Handler::Apache2 ?