I would bet that the backend crashed. Probably the backend sent the initial headers and start of the response to the load balancer, then stared rendering the p

I would bet that the backend crashed. Probably the backend sent the initial headers and start of the response to the load balancer, then stared rendering the page and crashed. Presumably `<!doctype html>` is hardcoded as it is always sent for HTML pages and maybe fills up one of the initial packets or something. The rest of the page may be rendered and return as separate chunks (or just one large content chunk).