The API Reference (doxygen-generated) documentation that’s crucial for plugin developers, and has been working consistently for a long time, today returns a 404 error.
http://docs.kicad.org/doxygen-python/namespacepcbnew.html
and subsidiary pages all now return a 404 error.
Sure would be fabulous if that could be re-instated!
(If there’s an alternative source for this info, I’d appreciate knowing about that too!)