Copilotfree, in-browser
Ask me anything about your lessons or your code.
“What is a port?” · “Why is my code erroring?”
Ask me anything about your lessons or your code.
“What is a port?” · “Why is my code erroring?”
The mechanism a server uses to grant specific other origins permission to read its responses, through Access-Control-Allow-Origin headers. It is a controlled hole in the same-origin policy. A server that reflects any origin back and allows credentials has opened its data to every site on the internet.