Sometimes you may want to load other website's page in your own website's iframe, but due to some security concerns, other website may have security configurations which prevent you from loading their pages into your iframe. In this case, if you try to load them, you would see a blank page or a text message telling that it's prohibited. Fortunately, you can detect this before you actually decide to load it.To prevent a page from being loaded by an iframe from other site, the response header sent to the browser will contain some options which denies the load. These response header opt...