By default, widgets in Zoho Creator can only access Creator’s own servers. Any requests made to external URLs will be blocked unless those URLs are explicitly whitelisted.
Whitelisting is the process of specifying external domains that your widget is allowed to communicate with, beyond the default Creator endpoints. This is especially useful when you're using client libraries or integrating with third-party services.
When to Whitelist URLs
If your widget needs to use any external client libraries or connect to services outside Creator, you must whitelist the required domains to allow access.