https://securityheaders.com/?q=iomtrainer.nl&followRedirects=on
So I want to implement the missing CSP rules. I tested a lot of possibility's via the recommended site https://www.cspisawesome.com/
but all rules gave me the 500 error.
Is there some way to test what options there are that should be set? Some step by step hand-out?
Best regards, Hein
brainy.nl