Add a domain name extension

This topic describes how to add a domain name extension.

1. Log on to the Server Load Balancer console.
2. Select the region of the target SLB instance.
3. Find the target SLB instance and click the instance ID.
4. Click the Listeners tab.
5. On the Listeners tab, find the target HTTPS listener, and choose More > Additional Domains in the Actions column.
   
   
   
6. Click Add Additional Domain and configure the domain name:
   1. Enter a domain name. The domain name can only contain letters, numbers, hyphens (-), and periods (.), and must start with a letter or a number. To check if the domain name you enter is valid, you can use the Alibaba Cloud domain name check tool.
      Domain name-based forwarding rules support exact match and wildcard match.

      • Exact domain name: www.aliyun.com
      • Wildcard domain name (generic domain name): *.aliyun.com, *.market.aliyun.com

        When a request matches multiple forwarding rules, exact match takes precedence over small-scale wildcard match and small-scale wildcard match takes precedence over large-scale wildcard match, as shown in the following table.

        Type	Request URL	Domain name-based forwarding rule
        		www.aliyun.com	*.aliyun.com	*.market.aliyun.com
        Exact match	www.aliyun.com	✓	×	×
        Wildcard match	market.aliyun.com	×	✓	×
        Wildcard match	info.market.aliyun.com	×	×	✓

   2. Select the certificate associated with the domain name.
      Note The domain name in the certificate must be the same as the added domain name extension.
   3. Click OK.
7. On the Listeners tab, find the target HTTPS listener and click Add Forwarding Rules in the Actions column.
8. On the Add Forwarding Rules page, configure the forwarding rule and click Add Forwarding Rules.
9. For more information, see Traffic forwarding based on domain names or URLs.
   Note Make sure that the domain name configured in the forwarding rule is the same as the added domain name extension.