Set custom HTTP Headers for CDN servers to add to requests to origin.
Go to CDN Resources tab -> Settings -> Show Advanced Settings -> HTTP Headers -> Add Request Headers.
The Header name field can contain letters (A-Z, a-z), numbers (0-9), dashes (-) and underscores (_).
The Value field can contain letters (A-Z, a-z), numbers (0-9), dashes (-), underscores (_), slashes (/), colons (:), equal (=), dots (.), and spaces.
If your Value field has several words you can add one space between two words. The Value field can't start or end with space.