Hello,
what's listed in the site you linked refers to the headers to be used, the actual string that needs to be put inside the .htaccess file are different.
Please take a look at this site: https://content-security-policy.com/
The actual rule you have to create is something like this: Header set Content-Security-Policy "default-src 'self';"
Once you're happy with the result, please remember to set your custom rule inside the fiels Custom rules at the bottom of the .htacces file, so you won't lose them if you regenerate the file using the Htaccess Maker.
Davide Tampellini
Developer and Support Staff
🇮🇹Italian: native 🇬🇧English: good • 🕐 My time zone is Europe / Rome (UTC +1)
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!