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对于404,HttpWebRequest抛出“远程服务器返回错误:(404)找不到”

httpwebrequest .net c#

Ian Boyd · 技术社区 · 6 年前

String url = @"http://stackoverflow.com/aaaaaaaa.html";

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

String responseText;

using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
   if (response.StatusCode == HttpStatusCode.NotFound) //404
      return "";

   using (StreamReader responseStream = new StreamReader(response.GetResponseStream()))
   {
      responseText = responseStream.ReadToEnd();
   }
}

问题是这条线:

request.GetResponse();

引发异常:

System.Net.HttpWebResponse

为什么是 HttpWebRequest 抛出一个异常;我如何让它停止?

或者

有人能推荐一个方法或.NET类,它让我与一个web服务器对话,并检索 404

HttpClient 有自己的 issues 把它排除在考虑之外。

0 回复 | 直到 6 年前

Merkle Groot 6 年前

下面是我之前编写的一些代码,欢迎您使用它们来处理这个场景。如果抛出异常,您可以通过捕捉WebException来获取状态代码。

public class WebResult
{
    public string Response { get; set; }
    public bool WasSuccessful { get; set; }
    public HttpStatusCode? StatusCode { get; set; }
}

public WebResult GetUrlContents(string url)
{
    try
    {
        var request = (HttpWebRequest)WebRequest.Create(url);

        using (var response = (HttpWebResponse)request.GetResponse())
        using (var responseStream = new StreamReader(response.GetResponseStream()))
        {
            return new WebResult
            {
                WasSuccessful = true,
                Response = responseStream.ReadToEnd(),
                StatusCode = response.StatusCode
            };
        }
    }
    catch (WebException webException)
    {
        return new WebResult
        {
            Response = null,
            WasSuccessful = false,
            StatusCode = (webException.Response as HttpWebResponse)?.StatusCode
        };
    }
}

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