const fetchProgress = (onProgress) => {
    return response => {
        const contentLength = response.headers.get('content-length') || 0;
        const total = parseInt(contentLength, 10);

        let loaded = 0;

        return new Response(
            new ReadableStream({
                start(controller) {
                    const reader = response.body.getReader();

                    read();
                    function read() {
                        reader.read().then(({done, value}) => {
                            if (done) {
                                controller.close();
                                return;
                            }
                            loaded += value.byteLength;
                            onProgress({loaded, total, percentage: loaded / total * 100})
                            controller.enqueue(value);
                            read();
                        });
                    }
                }
            })
        );
    };
};