Can't catch HttpRequestException when using HttpMessageHandler - .net-5

Question

I'm using HttpMessageHandler to log Http Request and Response. If internet connection is not available I get HttpRequestException, but this Exception is not catched (try catch not working). If I don't use HttpMessageHandler Exception is catched.
Method with try catch :
public JObject Get()
{
string url = "/...";
try
{
using (var httpClientHandler = new HttpClientHandler())
{
httpClientHandler.ServerCertificateCustomValidationCallback = (message, cert,
chain, errors) =>
{ return true; };
using (var client = new HttpClient(new LoggingHandler(httpClientHandler)))
{
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(
new MediaTypeWithQualityHeaderValue(CONTENT_TYPE_JSON));
var byteArray = Encoding.ASCII.GetBytes("");
client.DefaultRequestHeaders.Authorization = new
System.Net.Http.Headers.AuthenticationHeaderValue("Basic",
Convert.ToBase64String(byteArray));
HttpResponseMessage response = client.GetAsync(url).Result;
response.EnsureSuccessStatusCode();
var json = response.Content.ReadAsStringAsync().Result;
JObject rss = JObject.Parse(json);
return rss;
}
}
}
catch(HttpRequestException ex)
{
//Catch not working
return null;
}
}
HttpMessageHandler :
public class LoggingHandler : DelegatingHandler
{
private static readonly log4net.ILog log = log4net.LogManager.GetLogger(typeof(LoggingHandler));
public LoggingHandler(HttpMessageHandler innerHandler)
: base(innerHandler)
{
}
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,
CancellationToken cancellationToken)
{
HttpResponseMessage response = null;
Loging("Request:");
Loging(request.ToString());
if (request.Content != null)
{
Loging(await request.Content.ReadAsStringAsync());
}
Loging("");
response = await base.SendAsync(request, cancellationToken);
Loging("Response:");
Loging(response.ToString());
if (response.Content != null)
{
Loging(await response.Content.ReadAsStringAsync());
}
Loging("");
return response;
}
private void Loging(string message)
{
Debug.WriteLine(message);
log.Info(message);
}
}
Why is it happining?