The Blendee platform allows you to preview the messages and recommendations you are personalizing directly within the platform itself, in the preview window, visible in the image below:

If the preview has not been configured, you will receive a message such as “Connection denied”, this means that you are missing the Content Security Policy permissions, and in particular with regard to “X-Frame-Options”. In order to activate the permissions, it will be necessary to modify the Content Security Policy by inserting a frame-ancestors. This directive specifies valid “parents” who can embed a page using “<iframe>”, “frame”, “object”, or “embed”. Below is an example of how to insert such a directive.

Content-Security-Policy: frame-ancestors 'self' https://app.blendee.com;

For further details, please refer to the documentation for the Content Security Policy