AI solution for Interview Question on BFE.dev
147. What is Same-Origin policy ? How to share Cross-Origin resource?

Same-origin policy is a security policy implemented in web browsers to restrict web pages from accessing or manipulating data from another domain. According to this policy, web pages can only access resources (e.g., data, scripts, and cookies) located on the same domain and protocol, port number, and scheme.

Cross-Origin Resource Sharing (CORS) is a mechanism that enables web pages to share resources from other domains. CORS provides a safe way to bypass same-origin policy restrictions by controlling the access to cross-origin resources through HTTP headers.

To share resources across different origins, the server hosting the resource must include appropriate CORS headers in the response. These headers include "Access-Control-Allow-Origin" and "Access-Control-Allow-Methods" headers that specify which domains are allowed to access the resource, the supported HTTP methods, and other security requirements such as authentication and encryption.

In summary, CORS is a mechanism to safely allow cross-domain resource sharing, while same-origin policy is a security feature that restricts web pages' access to resources on other domains for security reasons.