What is CORS? | Cross-Origin Resource Sharing | CORS Explained!

#web_security #cors #sop #csrf
Understanding Cross-Origin Resource Sharing is essential if you’re a web developer or want to understand the browser security model. Cross-origin Resource Sharing is a way to relax the SOP, Same Origin Policy, the security mechanism whereby browsers prevent Cross-Site Request Forgery, or CSRF.

In this video, what is CORS, and Why we need it?. You’ll understand how we can bypass the Same Origin Policy with CORS and how HTTP headers are used to customize CORS implementation.

-------- Video Outline --------

00:09 Browser functionalities and security model
01:07 CSRF attack -- Cross-Site Request Forgery
01:41 Same Origin Policy
02:13 What is an Origin
03:05 CSRF and SOP
04:03 Relaxing SOP
04:41 Introducing CORS
05:17 CORS implementation -- HTTP Headers
06:45 Preflight Request
07:19 CORS in Web Browsers vs CLI client



Resources to know more:
https://developer.mozilla.org/en-US/d...
https://owasp.org/www-project-web-sec...


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