Hi,
The browser complains about a bug in main.js of Gantry5 for WP.
Looks like there is some code to set content-security which seems to be broken. Pleae refer to the file attached.
Screenshot is taken from
www.mientras-tanto.com
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Btw, should't this be set solely by the site maintainer in htaccess file?
For me this is annoying if scripts or php files configure content security or php error logging.