![]() When you make a cross-origin request, this is the request-response process: In browser terminology, the current browser URL is called the current origin and the third-party URL is cross-origin. In standard internet communication, your browser sends an HTTP request to the application server, receives data as an HTTP response, and displays it. You also need CORS if you want to allow authorized third-party access to your own server resources. For example, you need CORS when you want to pull data from external APIs that are public or authorized. You need it for authorized resource sharing with external third parties. So, the same-origin policy is highly secure but inflexible for genuine use cases.Ĭross-origin resource sharing (CORS) is an extension of the same-origin policy. The protocol, port, and hostname of the client's URL should all match the server it requests.įor example, consider the origin comparison for the below URLs with the client URL. Today, browsers enforce that clients can only send requests to a resource with the same origin as the client's URL. ![]() To prevent such CSRF issues, all browsers now implement the same-origin policy. Unauthorized users then had unintended access to the bank application. The external website then used the victim's cookie credentials and relayed data to the bank application while pretending to be the victim. Then they were tricked into loading an external website on a new browser tab. ![]() These issues sent fake client requests from the victim's browser to another application.įor example, the victim logged into their bank's application. In the past, when internet technologies were still new, cross-site request forgery (CSRF) issues happened. ![]()
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