使用HttpClient时如何解决302错误？

我创建了一个自定义DNN模块，该模块使用HTTPClient将信息发送到外部API。我的HttpClient方法如下：

public static async Task<string> CreatePayerResponse()
    {
        var credentials = GetCredentials();
        var objEventLog = new EventLogController();
        var gatewaySettings = new GatewaySetting_ProPay();
        SignupResult_ProPay result = new SignupResult_ProPay();
        using (HttpClient client = new HttpClient(new LoggingHandler(new HttpClientHandler())))
        {
            HttpRequestMessage request = new HttpRequestMessage();
            HttpResponseMessage response = new HttpResponseMessage();
            response.EnsureSuccessStatusCode();
            client.BaseAddress = new Uri("https://xmltestapi.propay.com/ProPayAPI/signup");
            client.DefaultRequestHeaders.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            string responseBody;
            GatewaySetting_ProPay gatewaySetting = new GatewaySetting_ProPay();
            SignupRequest payerRequest = new SignupRequest();
            HttpContent content = new StringContent(payerRequest.ToString());
            try
            {
                request.Headers.Add("Authorization", credentials);
                request.Headers.Add("accept", "application/json");
                response = await client.PutAsync("https://xmltestapi.propay.com/ProPayAPI/signup", content);
                responseBody = await response.Content.ReadAsStringAsync();
                objEventLog.AddLog("Merchant Onboarding Request Sent", portalSettings, userId,
                    response.ToString(), EventLogController.EventLogType.ADMIN_ALERT);
                Console.WriteLine(responseBody);

            }
            catch (HttpRequestException ex)
            {
                result.Succeeded = false;
                result.Status = ex.Message;
                objEventLog.AddLog("Merchant Onboarding Error!", portalSettings, userId, response.ToString(),
                    EventLogController.EventLogType.ADMIN_ALERT);
                Console.WriteLine("\nException Caught!");
                Console.WriteLine("Message :{0} ", ex.Message);
            }

            return response.Content.ToString();
        }
    }
public static string GetCredentials()
    {
        GatewaySetting_ProPay gatewaySettings = new GatewaySetting_ProPay();
        var billerAccountId = "mycreds";
        var authToken = "mycreds";
        var encodedCredentials =
            Convert.ToBase64String(Encoding.Default.GetBytes(billerAccountId + ":" + authToken));
        var credentials = string.Format("Basic {0}", encodedCredentials);
        return credentials;
    } 

当我将此方法关联到click事件时，将收到HTTP 302响应，并且没有任何内容发送到API。需要进行哪些修改以确保正确传输？

更新我仍然收到以下响应：

Error code 302 was received from server response.

尽管实现了该AllowAutoRedirect属性并将其设置为true。这是我编写的LoggingHandler类：

public LoggingHandler(HttpMessageHandler innerHandler) : base(innerHandler)
    {

    }
    protected async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken, HttpClientHandler handler)
    {
        Console.WriteLine("Request:");
        Console.WriteLine(request.ToString());
        if (request.Content != null)
        {
            Console.WriteLine(await request.Content.ReadAsStringAsync());
        }
        Console.WriteLine();
        handler.AllowAutoRedirect = true;
        HttpResponseMessage response = await base.SendAsync(request, cancellationToken);


        Console.WriteLine("Response:");
        Console.WriteLine(response.ToString());
        if (response.Content != null)
        {
            Console.WriteLine(await response.Content.ReadAsStringAsync());
        }
        Console.WriteLine();

        return response;
    }

这是实现HttpClientHandler和相关属性的正确方法吗？