503 could still be useful if combined with the Retry-After header but I wonder if any generic client code/library uses it in that way. https://developer.mozill

503 could still be useful if combined with the Retry-After header but I wonder if any generic client code/library uses it in that way. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Re...