abovesun abovesun - 3 months ago 22
PHP Question

How to prevent my site page to be loaded via 3rd party site frame of iFrame

How can I find out that my page is embedded as a frame to other site during page loading? I guess referrer request header can't help me here? Thanks.

Answer

You cannot check it from the server's side, but you can use javascript to detect it after the page has loaded. Compare top and self, if they're not identical, you are in a frame.

Additionally, some modern browsers respect the X-FRAME-OPTIONS header, that can have two values:

  • DENY – prevents the page from being rendered if it is contained in a frame
  • SAMEORIGIN – same as above, unless the page belongs to the same domain as the top-level frameset holder.

Users include Google's Picasa, that cannot be embedded in a frame.

Browsers that support the header, with the minimum version:

  • IE8 and IE9
  • Opera 10.50
  • Safari 4
  • Chrome 4.1.249.1042
  • Firefox 3.6.9 (older versions with NoScript)