Prevent Shiny app hosted on from being iframed (ie prevent Cross-frame Scripting (XFS) attacks and clickjacking)

Is there a way to prevent my Shiny App (hosted on from being iframed into another website? I'm looking to prevent XFS attacks and can't seem to find an option for this.

I'm guessing, since, it is hosted on that this isn't possible but I wanted to check and see if anyone else has managed this!