sorry, I've never used langchain, so can't really tell you specifically how to make it work
sorry, I've never used langchain, so can't really tell you specifically how to make it work

_routes.json a while ago but it's an area that I didn't add documentation about because, well, it should be reserved for advanced use cases where people absolutely know what they're doing and that excluding a file won't cause issues. e.g., favicon.ico would be safe to put in _routes.json, but the problem would be when people try to put actual routes in it - that would most likely lead to notable issues.