Scenario

DB-Views webpage embedded content (iframe) is displayed as a blank frame. Sometimes the following error message is displayed: “This content is blocked. Contact the site owner to fix the issue.”

Resolution

This may happen when the web server returns a Content-Security-Policy (CSP) header like this:
script-src ‘self’

How to fix

Your web server must be configured to return a Content-Security-Policy header like this:
frame-src https://app.db-views.com/