In case if you need to fetch your content from a particular IP other than from your defined domain, you can specify that IP under Origin IP Resolution. It resolves your domain from the defined IP so that CDN contact your server by IP instead of the domain. To do this, go to Http> Pull Zone > Origin IP Resolution. Then provide the IP from which you want to fetch the contents.
You can also provide a Custom Host Header to identify your site, in case your Web server has more than one website. For example, if your web server has IP address 126.96.36.199, and there are websites: [firstwebsite.com](), [secondwebsite.com](), [thirdwebsite.com]() and if we are requesting 188.8.131.52, and we put custom host header as “secondwebsite.com”, then that particular website will be cached.