How to implement basic auth like log:[email protected]?

Question

JavaScript

I'm trying to make authorization through a phantom I'm
sending a header

page.customHeaders = {
        'Authorization': 'Basic ' + btoa('user:pass');
};

After I try to get the hash, but it always returns the same, regardless of what I entered

page.onResourceRequested = function (requestData) {
        console.log(JSON.stringify(requestData.headers));
};