private async ValueTask <RemoteSchemaDefinition?> FetchSchemaDefinitionAsync( CancellationToken cancellationToken) { using var writer = new ArrayWriter(); IQueryRequest request = QueryRequestBuilder.New() .SetQuery( $@"query GetSchemaDefinition($c: String!) {{ {SchemaDefinitionFieldNames.SchemaDefinitionField}(configuration: $c) {{ name document extensionDocuments }} }}") .SetVariableValue("c", new StringValueNode(_configuration.Value)) .Create(); HttpRequestMessage requestMessage = await HttpRequestClient .CreateRequestMessageAsync(writer, request, cancellationToken) .ConfigureAwait(false); HttpResponseMessage responseMessage = await _httpClient .SendAsync(requestMessage, cancellationToken) .ConfigureAwait(false); IQueryResult result = await HttpRequestClient .ParseResponseMessageAsync(responseMessage, cancellationToken) .ConfigureAwait(false); if (result.Errors is { Count : > 1 })