Configure a Host Header Override Rule for an eCDN Zone

To support a single hostname across multiple realms, create a Host Header Override Rule for B2C Commerce sites that use an external content delivery network (CDN). This rule replaces unique hostnames with a common hostname to maintain the single-hostname setup. If you reuse a hostname, traffic can be unintentionally served from a different realm.

1. In Business Manager, click App Launcher , and then select Administration | Sites | Embedded CDN Settings.
2. Locate the zone you want to configure, and select Configure Zone from the dropdown menu.
   
3. Select the Host Header Override Rules tab, and then select New Rule. To switch to a different zone from this tab, select another name from the Zone dropdown menu.
4. Enter the Host Header Override Rule details:
   1. Enter the rule expression using the visual dropdown interface to select a field, operator, and value. This expression specifies the host header of incoming requests where the traffic goes. For example, Hostname equals shop.alpine.net.
   2. (Optional) If you want the rule to be active when you save it, select Enable Host Header Override Rule Upon Saving. If you’re not ready to activate the rule yet, create it first. When you’re ready, return to the Host Header Override Rules tab and enable your rule from the list.
   3. The Rule Name is automatically filled based on the rule details.
   4. Click Save. Upon saving, a check make sure that the rule’s host header ends with the same hostname as the current zone.
5. Modify your external CDN to route traffic to the proxy zones for each locale.