如何让HttpClient.PostAsync和邮递员的post一样工作？

using System;
using System.Net.Http;
using System.Threading.Tasks;

public class Program
{
    public static async Task Main()
    {
        using (HttpClient client = new HttpClient())
        {
            string url = "https://example.com/api/endpoint";
            string postData = "Hello, World!";

            HttpContent content = new StringContent(postData);

            HttpResponseMessage response = await client.PostAsync(url, content);

            if (response.IsSuccessStatusCode)
            {
                string responseContent = await response.Content.ReadAsStringAsync();
                Console.WriteLine(responseContent);
            }
            else
            {
                Console.WriteLine("Request failed with status code: " + response.StatusCode);
            }
        }
    }
}