When the back-to-source with the same protocol feature is enabled, back-to-source requests for resources will use the same protocol used by the client in order to request resources. If the client makes an HTTPS request for resources, but the resources are not cached on the node, a back-to-source HTTPS request will be made for resources. This protocol is also applicable for HTTP requests.
Note: The origin site must support both the port 80 and port 443; otherwise, the back-to-source may fail.
Log on to the CDN console.
On the left-side navigation pane, click Domain Names.
Select a domain to enter the management page.
Enable or disable the feature.