How does CORS affect API performance?

How does CORS affect API performance?

CORS, or Cross-Origin Resource Sharing, can impact API performance by adding additional HTTP headers and preflight requests.

What are preflight requests and when do they occur?

Preflight requests are sent by the browser to check if the actual request is safe to send. They occur for certain types of requests, like those using methods other than GET or POST.

Can CORS slow down my application?

Yes, if your application makes frequent cross-origin requests, the overhead from CORS headers and preflight checks can slow it down.

How can I optimize CORS for better performance?

You can optimize CORS by minimizing the number of cross-origin requests, using simple requests when possible, and caching preflight responses.