Call async method from sync method c#. Avoid deadlock c#

public static string Request()
{
    var result = Task.Run(() => GetResponse()).Result;
    return result;
}

public static async Task GetResponse()
{
    var httpClient = new HttpClient();
    string responseBody = string.Empty;
    try 
    {
        string resourceAddress = "......";
        string messageJson = "[.......]";
        httpClient.DefaultRequestHeaders.Accept
            .Add(new MediaTypeWithQualityHeaderValue("application/json"));
        HttpResponseMessage response = await httpClient
            .PostAsync(resourceAddress, new StringContent(messageJson, Encoding.UTF8, "application/json"));
        response.EnsureSuccessStatusCode();
        string responseBody = await response.Content.ReadAsStringAsync();
    }
    catch (HttpRequestException hrex)
    {
        //notification
    }
    catch (TaskCanceledException tcex)
    {
        //notification
    }
    catch (Exception ex)
    {
        //notification
    }
    finally 
    {
        if (httpClient != null) 
        {
            httpClient.Dispose();
            httpClient = null;
        }
    }
    return responseBody;
}