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Web apps in Lisp how-to: flash messages 
https://web-apps-in-lisp.github.io/building-blocks/flash-messages/index.html
Web Apps in Lisp: Know-howFlash messages :: Web Apps in Lisp: Know-howFlash messages are temporary messages you want to show to your users. They should be displayed once, and only once: on a subsequent page load, they don’t appear anymore.
They should specially work across route redirects. So, they are typically created in the web session.
Handling them involves those steps:
create a message in the session have a quick and easy function to do this give them as arguments to the template when rendering it have some HTML to display them in the templates remove the flash messages from the session. Getting started If you didn’t follow the tutorial, quickload those libraries:
@vindarel insightfull and great read as always thank you!!!