如何使用ASP.Net/C＃

读取客户端URL的HTTP标头状态代码当在ASP.Net中使用C＃读取URL时，需要读取HTTP标头的状态（403或404）。例如： URL1：https://www.instagram.com/khaniki.ah URL2：https://www.instagram.com/khaniki.ah123456 当我尝试读取URL1时，获取状态200（HttpStatusCode.Found），并且当它不存在时读取相同的URL2;查看更多照片。如何使用ASP.Net/C＃

而且，我用这个下面的代码：

var Url = UrlTbx.Text; 
    Uri urlCheck = new Uri(Url); 

    HttpWebRequest HttpRequest = (HttpWebRequest)WebRequest.Create(Url); 
    HttpRequest.Timeout = 15000; 
    HttpRequest.AllowAutoRedirect = false; 
    HttpRequest.ServicePoint.Expect100Continue = false; 
    HttpRequest.ContentType = "application/x-www-form-urlencoded"; 
    //HttpRequest.Method = "GET"; 
    HttpRequest.Method = "HEAD";//both methods was tested 
    HttpWebResponse HttpResponse; 

    try 
    { 
     HttpResponse = (HttpWebResponse)HttpRequest.GetResponse(); 

     if (HttpResponse.StatusCode == HttpStatusCode.Found) 
      Lit.Text = "YES" + "/" + HttpResponse.StatusCode; 
     else if (HttpResponse.StatusCode == HttpStatusCode.NotFound) 
      Lit.Text = "NO" + "/" + HttpResponse.StatusCode; 
    } 
    catch (Exception) 
    { 
     return false; 
    }

来源

2017-07-27 Amir Hussein Khaniki

你的要求似乎并不接受HEAD请求的服务器。尽量保持GET头的方法和尝试删除

HttpRequest.ContentType = "application/x-www-form-urlencoded";

还发现不是200你说的是对HttpStatusCode.OK 200 我得到的404你正在寻找做简单

时

var Url = "https://www.instagram.com/khaniki.ah123456/"; 
    Uri urlCheck = new Uri(Url); 

    HttpWebRequest HttpRequest = (HttpWebRequest)WebRequest.Create(Url); 

    HttpRequest.Method = "Get"; 

    var dHttpWebResponse = await HttpRequest.GetResponseAsync();

或HttpClient的API尝试，（避免除外）

var Url = "https://www.instagram.com/khaniki.ah123456/"; 
     Uri urlCheck = new Uri(Url); 
     var client = new HttpClient(); 
     var res = client.GetAsync(urlCheck).Result; 
     var statusCode = res.StatusCode; //should be 404

来源

2017-07-27 10:44:39 KitAndKat

我也用Get方法 –

我测试你的意见，但我无法找到或在标头中获取状态400。见响应“杂注：无缓存各不相同：接受语言内容语言：zh 严格，运输和安全性：最大年龄= 86400 连接：保持活跃的Content-Length：0 缓存控制：私人，no-cache，no-store，must-revalidate Content-Type：text/html; charset = utf-8 Date：Thu，27 Jul 2017 10:58:20 GMT Expires：Sat，01 Jan 01 00： 00:00 GMT 位置：https://www.instagram.com/khaniki.ah123456/“ –

我更新了我的答案，httpclient类你应该有一个404而不是一个例外 – KitAndKat

如何使用ASP.Net/C＃

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