Why Does CDN Pre-loading Fail?

Perform the following operations to locate the cause:

• Check whether URL validation has been configured. If yes, use the signed URL for pre-loading. Otherwise, the pre-loading will fail.
• Check whether referer validation has been configured. If yes, select Include blank referer. Otherwise, the pre-loading will fail.

If the problem persists, you are advised to submit a service ticket for technical support.