On the server side I'm using Rails. Purposely, I did not configure the CORS. Thus, as I expected, in the browser I can not do requests to the Rails server because I get this error:
But I can do for the terminal, using curl:
macabeus@macabeus-acer ~ $ curl http://localhost:3000/people
[{"id":3,"name":"macabeus","age":20,"created_at":"2016-07-31T22:45:05.490Z","updated_at":"2016-07-31T22:45:05.490Z"},{"id":4,"name":"foo","age":10,"created_at":"2016-07-31T22:45:24.415Z","updated_at":"2016-07-31T22:45:24.415Z"}]
For what reason the curl can, but the browser can't?