/// <summary>
        /// Adds a backend definition
        /// </summary>
        /// <param name="handler">The source handler</param>
        /// <param name="url">The URL (absolute or relative, may contain * wildcards) to match</param>
        /// <returns>The <see cref="T:MockedRequest"/> instance</returns>
        public static MockedRequest When(this MockHttpMessageHandler handler, string url)
        {
            var message = new MockedRequest(url);

            handler.AddBackendDefinition(message);

            return(message);
        }
        /// <summary>
        /// Adds a backend definition
        /// </summary>
        /// <param name="handler">The source handler</param>
        /// <param name="method">The HTTP method to match</param>
        /// <param name="url">The URL (absolute or relative, may contain * wildcards) to match</param>
        /// <returns>The <see cref="T:MockedRequest"/> instance</returns>
        public static MockedRequest When(this MockHttpMessageHandler handler, HttpMethod method, string url)
        {
            var message = new MockedRequest(url);

            message.With(new MethodMatcher(method));

            handler.AddBackendDefinition(message);

            return(message);
        }