Using SPFServerManager.exe with the /dwl argument creates a whitelist of domain host URLs to limit file download requests to only those from authorized domains. Separate multiple domain hosts using commas.
/dwl: Identifies the domain host URLs authorized to download files to the Web Client.
This example creates a download whitelist of domain hosts for the server SDx.
SPFServermanager.exe /sn:SDx /dwl:"https://domain1.com, https://domain2.com"