/// <summary>
        /// Adds the <see cref="Twitter2Middleware"/> middleware to the specified <see cref="IApplicationBuilder"/>, which enables Twitter2 authentication capabilities.
        /// </summary>
        /// <param name="app">The <see cref="IApplicationBuilder"/> to add the middleware to.</param>
        /// <param name="configureOptions">An action delegate to configure the provided <see cref="Twitter2Options"/>.</param>
        /// <returns>A reference to this instance after the operation has completed.</returns>
        public static IApplicationBuilder UseTwitter2Authentication(this IApplicationBuilder app, Action <Twitter2Options> configureOptions = null)
        {
            if (app == null)
            {
                throw new ArgumentNullException(nameof(app));
            }

            var options = new Twitter2Options();

            if (configureOptions != null)
            {
                configureOptions(options);
            }
            return(app.UseTwitter2Authentication(options));
        }
        /// <summary>
        /// Adds the <see cref="Twitter2Middleware"/> middleware to the specified <see cref="IApplicationBuilder"/>, which enables Twitter2 authentication capabilities.
        /// </summary>
        /// <param name="app">The <see cref="IApplicationBuilder"/> to add the middleware to.</param>
        /// <param name="options">A <see cref="Twitter2Options"/> that specifies options for the middleware.</param>
        /// <returns>A reference to this instance after the operation has completed.</returns>
        public static IApplicationBuilder UseTwitter2Authentication(this IApplicationBuilder app, Twitter2Options options)
        {
            if (app == null)
            {
                throw new ArgumentNullException(nameof(app));
            }

            if (options == null)
            {
                throw new ArgumentNullException(nameof(options));
            }

            return(app.UseMiddleware <Twitter2Middleware>(options));
        }