The 423 status code is a Tencent Cloud CDN custom status code. CDN will report a 423 error when it detects a loopback request. We recommend you check the following:
if you use this method, we recommend you enable HTTPS configuration to force HTTPS redirection and change the origin-pull method to protocol follow. Otherwise, multiple redirects may occur. For the configuration steps, please see HTTPS Acceleration Configuration Guide.
This is caused by the IP access limit configured in the CDN Console as shown below:
- IP access limit is designed to restrict the number of times an IP is allowed to access a node within one second. If the limit is exceeded, a 514 error will be returned.
- Setting a low limit may affect the use of your business by normal high-frequency users. Therefore, please set a reasonable threshold. For more information, please see IP Access Limit Configuration.
Check the following:
In case of origin server exception, if the cache on the CDN node accessed by the user request has not expired, the node will directly return the requested content to the client. If the cache has expired, it will not respond and an origin-pull request will be initiated.