/// <summary>
        /// Adds the <see cref="BaiduMiddleware"/> middleware to the specified <see cref="IApplicationBuilder"/>, which enables Baidu 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="BaiduOptions"/>.</param>
        /// <returns>A reference to this instance after the operation has completed.</returns>
        public static IApplicationBuilder UseBaiduAuthentication(this IApplicationBuilder app, Action <BaiduOptions> configureOptions)
        {
            if (app == null)
            {
                throw new ArgumentNullException(nameof(app));
            }

            var options = new BaiduOptions();

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

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

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

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

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