public static IApplicationBuilder UseSpotifyProxy(this IApplicationBuilder app, Action <SpotifyProxyOptions> configCallback)
        {
            var options = new SpotifyProxyOptions();

            configCallback(options);

            return(app.UseMiddleware <SpotifyProxyMiddleware>(options));
        }
        public static IApplicationBuilder UseSpotifyProxy(this IApplicationBuilder app, SpotifyProxyOptions options = null)
        {
            if (options == null)
            {
                options = new SpotifyProxyOptions();
            }

            return(app.UseMiddleware <SpotifyProxyMiddleware>(options));
        }