如何使用ASP.Net/C＃

讀取客戶端URL的HTTP標頭狀態代碼當在ASP.Net中使用C＃讀取URL時，需要讀取HTTP標頭的狀態（403或404）。例如： URL1：https://www.instagram.com/khaniki.ah URL2：https://www.instagram.com/khaniki.ah123456 當我嘗試讀取URL1時，獲取狀態200（HttpStatusCode.Found），並且當它不存在時讀取相同的URL2;查看更多照片。如何使用ASP.Net/C＃

而且，我用這個下面的代碼：

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; 
    }

來源

2017-07-27 Amir Hussein Khaniki

你的要求似乎並不接受HEAD請求的服務器。儘量保持GET頭的方法和嘗試刪除

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

還發現不是200你說的是對HttpStatusCode.OK 200 我得到的404你正在尋找做簡單

時

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嘗試，（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

來源

2017-07-27 10:44:39 KitAndKat

我也用Get方法 –

我測試你的意見，但我無法找到或在標頭中獲取狀態400。見響應「雜注：無緩存各不相同：接受語言內容語言：zh 嚴格，運輸和安全性：最大年齡= 86400 連接：保持活躍的Content-Length：0 緩存控制：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類你應該有一個404而不是一個例外 – KitAndKat

如何使用ASP.Net/C＃

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