Let's suppose the webapp has list of external URLs. User clicks one of those URLs and goes to another website. How do I show the first webapp's header on top of the other websites?

<http://www.stumbleupon.com/>

These guys use iframe for this purpose, but if I will try to add a page from Pinterest, for example, then I will get only the Stumbleupon's header and blank body because `x-frame-options` of pinterest is set to `sameorigin`.