Fiz a aula 3, executei o server. No diretorio do client, executei "lite-server", ocorre o erro: Dentro do construtor <> app.component.js:17:9 Angular 2 is running in the development mode. Call enableProdMode() to enable the production mode. core.umd.js:210:9 Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:3000/v1/fotos. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). (unknown) Erro: Response with status: 0 for URL: null app.component.js:20:99