I added the following to my nginx site conf file:
add_header X-Frame-Options DENY
What I noticed is that if I view the http headers of my site the rt-Fastcgi-Cache parameter no longer shows up. I see nothing about that at all.
If I remove the add_header X-Frame-Options DENY from my conf file, then I am able to see the rt-Fastcgi-Cache in my header.
Why would this happen, are they not totally unrelated functions?
With this problem, is there a better way to make sure that my site cannot be Iframed?