some ln address providers do not support CORS which is a problem for websites. So we made this proxy application that does nothing else than requesting and returning all the LNURL details and has CORS enabled. we use this also in the alby-tools package: e.g.

GitHub

GitHub - getAlby/js-lightning-tools: Collection of helpful building blocks and tools to develop Bitcoin Lightning web apps

Collection of helpful building blocks and tools to develop Bitcoin Lightning web apps - getAlby/js-lightning-tools