What a Cross-Site Request Forgery Attack Is and How to Prevent It

When you are browsing a website, it is typical for that website to request data from another website on your behalf. For example, in most cases, a video that is shown on a website is not typically stored on the website itself. The video appears to be on the website but it is actually being embedded from video streaming websites such as youtube.com. That’s how Content Delivery Networks (CDNs), which are used to deliver content faster, work. Many websites store scripts, images, and other bandwidth-hungry resources on CDNs, so when you are browsing them the images and script files are downloaded from a CDN source near you rather than from the website itself.

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