A few days ago I added a new server to the website, using Alibaba Cloud for Redis, the server itself, MySQL, and more.
After bringing it online and enabling load balancing, the Nginx logs showed a large number of 499 status errors, all of which were POST requests:
The new server environment was identical to the original server, which was working fine. Following online tutorials, I added the following to the configuration file, but it still didn’t fix the issue:
proxy_ignore_client_abort on ;
Since all the errors were POST requests, I suspected a problem during the data submission process. After further investigation, it turned out I had forgotten to add the Alibaba Cloud Redis whitelist, which caused premature data anomalies in the database. The issue was resolved after adding the wh