Yet it feels like this is something you could just build a library for in your web app. I'm sure there are favicon pullers/cachers for every language out there.

Yet it feels like this is something you could just build a library for in your web app. I'm sure there are favicon pullers/cachers for every language out there. I know tt-rss has one for it's RSS job. It seems like something silly to depend on an external service for.