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Issue Invalid nginx configuration: nginx: [emerg] invalid number of arguments in "add_header"

I think that this could be an issue with the Nginx version. One possible solution could be to enclose value and parameters in single quotes and to omit other single quotes inside the parameter string. Example:
Code:
add_header 'Content-Security-Policy' 'default-src self unsafe-inline *.akamai.net *.doubleclick.net [... add more as required ...]; font-src self fonts.googleapis.com fonts.gstatic.com';
 
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