如何查看由System.Net.HttpWebRequest返回的http 500的正文

要查看由System.Net.HttpWebRequest返回的HTTP 500错误的正文，可以使用以下解决方法：

1. 使用HttpWebResponse对象获取错误的响应：

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://example.com");
HttpWebResponse response = null;

try
{
    response = (HttpWebResponse)request.GetResponse();
}
catch (WebException ex)
{
    response = (HttpWebResponse)ex.Response;
}

string responseBody = string.Empty;
if (response != null)
{
    using (Stream responseStream = response.GetResponseStream())
    {
        using (StreamReader reader = new StreamReader(responseStream))
        {
            responseBody = reader.ReadToEnd();
        }
    }
}

Console.WriteLine(responseBody);

2. 使用HttpClient对象获取错误的响应：

HttpClient client = new HttpClient();

HttpResponseMessage response = await client.GetAsync("http://example.com");
string responseBody = string.Empty;

if (response.IsSuccessStatusCode)
{
    responseBody = await response.Content.ReadAsStringAsync();
}
else
{
    responseBody = await response.Content.ReadAsStringAsync();
    Console.WriteLine(responseBody);
}

无论使用哪种方法，都可以通过读取responseBody变量来获取HTTP 500错误的正文内容。