CORS error Laravel. Why is my request not going through?

Question

CORS

I'm learning to work with Laravel and trying to create my own API was not successful

Access to XMLHttpRequest at 'http://127.0.0.1:8000/api/heroes' from origin 'http://localhost:4200' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed.

GET http://127.0.0.1:8000/api/heroes net::ERR_FAILED

Answer 1

We read about CORS, we learn that requests from non-identical ports are blocked, we prescribe it in the CORS config http://localhost:4200.