Client to call Azure for signing keys for SPA with oidc-client

AzureSigningKey.cs

using Newtonsoft.Json;

namespace Web.DataTransferObjects.Utilities
{
    /// <summary>
    /// Azure signing key structure
    /// </summary>
    public class AzureSigningKey
    {        
        /// <summary>
        /// 
        /// </summary>
        public string Kty { get; set; }
     
        /// <summary>
        /// 
        /// </summary>
        public string Use { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string Kid { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string X5T { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string N { get; set; }
    
        /// <summary>
        /// 
        /// </summary>
        public string E { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public string[] X5C { get; set; }
    }

    /// <summary>
    /// Full Azure Key
    /// </summary>
    public class AzureKey
    {
        /// <summary>
        /// Keys
        /// </summary>
        [JsonProperty("keys")]
        public AzureSigningKey[] AzureSigningKeys { get; set; }
    }
}

SigningKeysClient.cs

using System;
using System.Net.Http;
using System.Threading.Tasks;
using DataTransferObjects.Utilities;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace Web.Utilities
{
    /// <summary>
    /// Client to call Azure for Signing Keys for spa
    /// </summary>
    public class SigningKeysClient
    {
        private HttpClient _client;
        private ILogger<SigningKeysClient> _logger;
        
        /// <summary>
        /// Signing keys client
        /// </summary>
        /// <param name="client"></param>
        /// <param name="logger"></param>
        /// <param name="config"></param>
        public SigningKeysClient(HttpClient client, ILogger<SigningKeysClient> logger, IConfiguration config)
        {
            _client = client;
            _client.BaseAddress = new Uri($"https://login.microsoftonline.com"); 
            _logger = logger;            
        }

        /// <summary>
        /// Query azure for latest signing keys
        /// </summary>
        /// <returns></returns>
        public async Task<AzureKey> GetSigningKeysAsync()
        {
            try
            {
                var keysUrl = new Uri($"/common/discovery/keys", UriKind.Relative);
                _logger.LogWarning($"HttpClient: Loading {keysUrl}");
                var res = await _client.GetAsync(keysUrl);
                res.EnsureSuccessStatusCode();
                var retrunValue = await res.Content.ReadAsAsync<AzureKey>();
                return retrunValue;
            }
            catch (HttpRequestException ex)
            {
                _logger.LogError($"An error occurred connecting to jwks URI API {ex.ToString()}");
                throw;
            }
        }
    }
}