What is CORS and how do credentials work with it?

What is CORS and how does it affect web applications?

CORS stands for Cross-Origin Resource Sharing. It's a security feature that allows or restricts resources on a web page to be requested from another domain outside the domain from which the first resource was served.

How do credentials work with CORS?

When making cross-origin requests, credentials such as cookies or HTTP authentication are only sent if the request's 'withCredentials' property is set to true and the server responds with the appropriate CORS headers.

What headers do I need to set on the server for CORS with credentials?

You need to set the 'Access-Control-Allow-Origin' header to the requesting origin and include 'Access-Control-Allow-Credentials: true' to allow credentials.

Can I use CORS with any type of request?

Yes, CORS can be used with any type of request, including GET, POST, and PUT, but the server must be configured to handle each type appropriately.