Getting 'Cross-Origin Request Blocked' on a GET request

Summary

I’m making a GET request to 4chan’s API for retrieving threads from a board. This is my code:

const board = this.props.routeParams.tag;
var config = {
    headers: {'Access-Control-Allow-Origin': '*'}
};
axios.get('https://a.4cdn.org/' + board + '/threads.json', config)
    .then(function (response) {
        console.log(response.data);
});

I receive the following warning:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://a.4cdn.org/a/threads.json. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). As seen above, I have added the relevant header, but it does not solve the issue. I made the same request from my terminal using cURL and it worked fine.

Context

• axios version: e.g.: v0.16.0
• Environment: e.g.: node v6.9.4, Firefox 51.0.1, Ubuntu 14.04

[ronnin]

Access-Control-Allow-Origin is a response header, not request header: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin

axios.get(url, { headers: {‘Access-Control-Allow-Origin’: *} } ) means nothing!

try axios.get(url, { crossdomain: true })

[JoseTavares]

Any news on this? I’m pretty much in the same boat…