public async Task <Response <ExpressRouteConnection> > GetAsync(string resourceGroupName, string expressRouteGatewayName, string connectionName, CancellationToken cancellationToken = default)
        {
            if (resourceGroupName == null)
            {
                throw new ArgumentNullException(nameof(resourceGroupName));
            }
            if (expressRouteGatewayName == null)
            {
                throw new ArgumentNullException(nameof(expressRouteGatewayName));
            }
            if (connectionName == null)
            {
                throw new ArgumentNullException(nameof(connectionName));
            }

            using var message = CreateGetRequest(resourceGroupName, expressRouteGatewayName, connectionName);
            await _pipeline.SendAsync(message, cancellationToken).ConfigureAwait(false);

            switch (message.Response.Status)
            {
            case 200:
            {
                ExpressRouteConnection value = default;
                using var document = await JsonDocument.ParseAsync(message.Response.ContentStream, default, cancellationToken).ConfigureAwait(false);

                value = ExpressRouteConnection.DeserializeExpressRouteConnection(document.RootElement);
                return(Response.FromValue(value, message.Response));
            }