¿Qué es la política CORS del mismo origen?

What is CORS same-origin policy?

The same-origin policy is an important security feature of any modern browser. Its purpose is to restrict cross-origin interactions between documents, scripts, or media files from one origin to a web page with a different origin.

Occasionally, the same origin policy may block requests between subdomains on the same domain. The easiest way to solve this problem is to set document. domain from within JavaScript.

The same-origin policy is a critical security mechanism that restricts how a document or script loaded by one origin can interact with a resource from another origin. It helps isolate potentially malicious documents, reducing possible attack vectors.

It is completely safe to augment any resource with Access-Control-Allow-Origin: * as long as the resource is not part of an intranet (behind a firewall). In other words, a URL you can fetch from a server on the internet using wget or curl .

Details. The same-origin policy restricts which network messages one origin can send to another. For example, the same-origin policy allows inter-origin HTTP requests with GET and POST methods but denies inter-origin PUT and DELETE requests.

In computing, the same-origin policy (sometimes abbreviated as SOP) is an important concept in the web application security model. Under the policy, a web browser permits scripts contained in a first web page to access data in a second web page, but only if both web pages have the same origin.

Now, due to this limitation many CORS was implemented to enable websites to do cross origin request. but as per my understanding implementing CORS defy the security purpose of the “Same Origin Policy” SOP. CORS is just to provide extra control over which request server wants to serve.

Cross-Origin Resource Sharing (CORS) Cross-Origin Resource Sharing ( CORS) is a mechanism that uses additional HTTP headers to tell browsers to give a web application running at one origin, access to selected resources from a different origin.

CORS actually exists because of another policy known as the Same Origin Policy. Let’s see what that is. SOP is a security policy on the browser that restricts how a document or script that is loaded from one origin can interact with a resource or data from another origin.

If the user’s browser implements CORS, the following request header would be sent: If online-personal-calendar.com allows the request, it sends an Access-Control-Allow-Origin header in its response. The value of the header indicates what origin sites are allowed.