Downtime detection (dnspod)

How do I configure downtime detection?

1. What is downtime detection?
Downtime Detection: After a server is confirmed to be down, the system automatically switches to the available server. After the server is down, the system automatically switches back to the original IP address (note: the system does not enable downtime detection by default. You need to manually enable downtime monitoring)
Principle of Detection: we will initiate an HTTP request to the target server. When there is no response at all, we will think that the server is down for operation. (Note that only a warning is prompted when an error such as 403,500 is returned, and IP switching is not performed .)

2. Under what circumstances will the downtime detection function be used?
(1) It should be noted that the downtime detection does not result in server downtime and the backup server takes effect immediately. We all know that the resolution records are cached, coupled with the number of downtime detection times, no matter how it is modified, it is necessary to wait for the old record cache to expire so that the new record can take effect.
(2) If you are worried that the server will go down during unattended maintenance, if you have something to do, you cannot manually Replace the backup server, or if you just want to worry about it, you can try downtime detection.

3. How to set and use downtime detection?
Current downtime monitoringOnly a records are supported.And cannot be a wildcard domain name!