Configure a Hostname Alias
A hostname alias is required if you want to create short, meaningful URLs for external search engines to index. Assign at least one hostname alias that is the current hostname on which the instance is running.
You can also create a simpler alias that reflects your store or brand name. Putting a simple Page URL in the alias list, such as "www.mystore.com", enables users to get to the storefront without typing in the full Salesforce B2C Commerce URL, such as:
http://www.mystore.com/on/demandware.store/Sites-MYS-Site/default
.
Ideally, the long URL is only visible to search engines if someone posts a link containing the long URL.
Important: If you don't assign an alias to your site, enabling
search-friendly URLs causes the storefront to show a 404 error for all
URLs besides the Welcome page.