@jlengstorf @SalientKnight @cassidoo @levlinds FWIW this is the exact usecase I had in this example which is framework agnostic. 404s are handled by a servlerless function which attempts to render content on demand.
https://css-tricks.com/static-first-pre-generated-jamstack-sites-with-serverless-rendering-as-a-fallback/
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