Xml retriever using GraphQL

CustomGraphQlSitemapXmlServiceHandler.cs

public class CustomGraphQlSitemapXmlServiceHandler : CustomGraphQlLayoutBaseServiceHandler<XmlResult>
{
    private readonly IGraphQLRequestBuilder _graphQLRequestBuilder;
    private readonly IGraphQLClientFactory _graphQLClientFactory;
    private readonly MvpSiteSettings _configuration;
    private Task<List<XmlResult>> result;

    public CustomGraphQlSitemapXmlServiceHandler(IConfiguration configuration, IGraphQLRequestBuilder graphQLRequestBuilder, IGraphQLClientFactory graphQLClientFactory)
    {
        _graphQLRequestBuilder = graphQLRequestBuilder;
        _graphQLClientFactory = graphQLClientFactory;
        _configuration = configuration.GetSection(MvpSiteSettings.Key).Get<MvpSiteSettings>();
    }

    public async override Task<List<XmlResult>> GetSitemap()
    {
        var client = _graphQLClientFactory.CreateGraphQlClient();
        var query = Constants.GraphQlQueries.GetSitemapSearchQuery;
        var variables = (object)new
        {
            itemId = _configuration.SitemapXmlItemId,
            language = _configuration.DefaultLanguage
        };

        var request = _graphQLRequestBuilder.BuildRequest(query, variables);
        var graphQlResponse = await client.SendQueryAsync<SitemapXmlData>(request);

        return graphQlResponse.Data.Search.Results;
    }
}