me aparece el tipico bloqeo de CORs cuando hago la peticion POST
Access to fetch at 'http://localhost:3001/tickets' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled
function postTickets(data) { return fetch("http://localhost:3001/tickets", { method: "POST", body: JSON.stringify(data.user_name), headers: { Accept: "application/json", Authorization: "Bearer " + data.tok, }, }) .then((datos) => { return datos.json(); }) .catch(console.log); }