HTML5 / Node V8 `fetch()` does not support progress events so you have to use the XHR / XMLHttpRequest object. Here is a simple ES6 + promises wrapper by @caub

futch.js

// https://github.com/github/fetch/issues/89#issuecomment-256610849
function futch(url, opts={}, onProgress) {
    return new Promise( (res, rej)=>{
        var xhr = new XMLHttpRequest();
        xhr.open(opts.method || 'get', url);
        for (var k in opts.headers||{})
            xhr.setRequestHeader(k, opts.headers[k]);
        xhr.onload = e => res(e.target.responseText);
        xhr.onerror = rej;
        if (xhr.upload && onProgress)
            xhr.upload.onprogress = onProgress; // event.loaded / event.total * 100 ; //event.lengthComputable
        xhr.send(opts.body);
    });
}

futch('/').then(console.log)