Why does nginx give a 499 error when preloading Wordpress site pages into the cache?

Question

Nginx

There is a WP Rocket caching plugin that generates pages on its own so that they are available from the cache. In the logs, almost all page accesses have a status of 499, sometimes 200. I can not understand the reason why the client (Wordpress cron task) quickly closes the connection.

Answer 1

How to bypass 499 nginx error?