:What is a second-level domain name and what limits does it have?

The external IP address of API Gateway may change. Therefore, you must create a CNAME record for your independent domain name and map the CNAME record to a fixed second-level domain name. This way, you can access API Gateway over the Internet reliably.

Note: The system-assigned second-level domain name is for testing purposes only. You can use it directly to make a limited number of API calls. For regions outside the Chinese mainland, the limit is 100 calls per day. For regions inside the Chinese mainland, the limit is 1,000 calls per day. You must bind your own independent domain name to provide your APIs.