Tests the 'X-Frame-Options' header which prevents sites from being displayed inside an iframe.
This test will look for the presence of the 'X-Frame-Options' header and make sure it has a value of either
DENY. If the header is missing or has a different value, a warning will be displayed.
This HTTP response header is used to prevent the page from being loaded inside of an iframe. A server can use this to protect against certain attacks and to prevent their content from being embedded in other websites.
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