What is Cross-Origin Resource Sharing (CORS)?

What is Cross-Origin Resource Sharing (CORS)?

What is Cross-Origin Resource Sharing (CORS)? Why CORS?, Identifying a CORS Response, CORS Request Types- Simple and Preflight Requests, Handling CORS Error. Cross-Origin Resource Sharing (CORS) is a protocol that enables scripts running on a browser client to interact with resources from a different origin. This is useful because thanks to the same-origin policy followed by XMLHttpRequest and fetch, JavaScript can only make calls to URLs that live on the same origin as the location where the script is running

What is Cross-Origin Resource Sharing (CORS)? Why CORS?, Identifying a CORS Response, CORS Request Types- Simple and Preflight Requests, Handling CORS Error.

Cross-Origin Resource Sharing (CORS) is a protocol that enables scripts running on a browser client to interact with resources from a different origin. This is useful because thanks to the same-origin policy followed by XMLHttpRequest and fetch, JavaScript can only make calls to URLs that live on the same origin as the location where the script is running.

For example, if a JavaScript app wishes to make an AJAX call to an API running on a different port, it would be blocked from doing so thanks to the same-origin policy. CORS error in the console will look like this:

CORS — Why Is It Needed?

Most of the time, a script running in the user’s browser would only ever need to access resources on the same origin (think about API calls to the same backend that served the JavaScript code in the first place). So the fact that JavaScript can’t normally access resources on other origins is a good thing for security.

The same-origin policy fights one of the most common cyber-attacks out there: Cross-Site Request Forgery CSRF. In this maneuver, a malicious website attempts to take advantage of the browser’s cookie storage system.

In this context, “other origins” means the URL being accessed differs from the location that the JavaScript is running from, by having:

  • a different scheme (HTTP or HTTPS)
  • a different domain
  • a different subdomain
  • a different port

web-development software-development javascript

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