How to read HTTP-Header status code of client URL by using ASP.Net/C#

Question

I need to read status (403 or 404) of HTTP-header when read a URL by using C# in ASP.Net. For example: URL1: https://www.instagram.com/khaniki.ah URL2: https://www.instagram.com/khaniki.ah123456 I get status 200 (HttpStatusCode.Found) when I try to read URL1 and same for reading URL2 while it's not exist; See more in photos.

Also, I use this following code:

    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;
    }

KitAndKat · Accepted Answer · 2017-07-27 15:20:34Z

2

The server you're requesting doesn't seem to accept HEAD requests. Try to keep the GET header method and try to remove

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

Also Found is not 200. You're talking about HttpStatusCode.OK for 200. I get the 404 you're looking for when doing simply

   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();

or try with the httpclient api, (to avoid the exception)

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

edited Jul 27, 2017 at 15:20

answered Jul 27, 2017 at 10:44

KitAndKat

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6 Comments

Amir Hussein Khaniki Over a year ago

I also used Get method

Amir Hussein Khaniki Over a year ago

I tested your opinion but I cannot find or get status 400 in header. See response "Pragma : no-cache Vary : Accept-Language Content-Language : en Strict-Transport-Security : max-age=86400 Connection : keep-alive Content-Length : 0 Cache-Control : private, 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 2000 00:00:00 GMT Location : instagram.com/khaniki.ah123456"

KitAndKat Over a year ago

I updated my answer, with httpclient class you should have a 404 instead of an exception

Amir Hussein Khaniki Over a year ago

It works and tank you! Is there any other solution or suggestion that return code?

KitAndKat Over a year ago

I don"t understand , what do you want ? another solution ? if you want to stick with the WebRequest one, you have to catch the WebException and read the status code inside it... if it's ok then you can mark this as answered by checking it.

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