In order to increase the security of web applications, it is good practice to use HTTP security headers. These include, among others Content Security Policy (CSP) headers.
To use the tracking code on a server with CSP enabled, the CSP header must be set as follows:
Header set Content-Security-Policy “script-src
‘self’ https: //*.etracker.comhttps: //*.etracker.de ‘unsafe-inline’;”