By default, a CDN server passes all HTTP headers it receives from client's origin to end-users.
Enable Hide Headers option to adjust the headers that are being passed.
After enabling the list of the most popular headers will appear in the field:
To delete the header press ×.
You can also add your custom headers. The new header can contain such characters as letters (a-z), numbers (0-9), dashes (-), underscores (_). If the header is added correctly, it will appear in the orange square.
These are default headers which can't be hidden: