OpenIdConnectConfigurationRetriever.cs

        public static async Task<OpenIdConnectConfiguration> GetAsync(string address, IDocumentRetriever retriever, CancellationToken cancel)
        {
            OpenIdConnectConfiguration openIdConnectConfiguration = JsonConvert.DeserializeObject<OpenIdConnectConfiguration>(doc);
            if (!string.IsNullOrEmpty(openIdConnectConfiguration.JwksUri))
            {
                string keys = await retriever.GetDocumentAsync(openIdConnectConfiguration.JwksUri, cancel).ConfigureAwait(false);

                openIdConnectConfiguration.JsonWebKeySet = JsonConvert.DeserializeObject<JsonWebKeySet>(keys);
                foreach (SecurityKey key in openIdConnectConfiguration.JsonWebKeySet.GetSigningKeys())
                {
                    openIdConnectConfiguration.SigningKeys.Add(key);
                }
            }

            return openIdConnectConfiguration;
        }