How do i check for a 302 response? WebRequest

Question

Using WebRequest I want to know if I get a

"302 Moved Temporarily"

response instead of automatically get the new url.

whoops, i assume if you wouldnt know how to do it with WebRequest if you dont know what WebRequest is. .NET is a better tag, oops. — , Sep 08 '09 at 01:35

score 34 · Accepted Answer · edited Sep 12 '17 at 16:06

34

If you want to detect a redirect response, instead of following it automatically create the WebRequest and set the AllowAutoRedirect property to false:

HttpWebRequest request = WebRequest.Create(someUrl) as HttpWebRequest;
request.AllowAutoRedirect = false;
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
if (response.StatusCode == HttpStatusCode.Redirect || 
    response.StatusCode == HttpStatusCode.MovedPermanently)
{
    // Do something here...
    string newUrl = response.Headers["Location"];
}

edited Sep 12 '17 at 16:06

Bryan

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answered Sep 08 '09 at 00:26

devstuff

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1

Haven't verified this myself, but I just found something saying: "If the HttpWebRequest.AllowAutoRedirect property is false, HttpStatusCode.Found will cause an exception to be thrown." Source: http://www1.cs.columbia.edu/~lok/csharp/refdocs/System.Net/types/HttpStatusCode.htm – Nathan Taylor Sep 08 '09 at 00:41
@Nathan: I don't really see how, since HttpStatusCode is an enum. The linked documentation (needs to end in '.html' BTW) appears to be out of date; that sentence was probably a cut-and-paste bug. – devstuff Sep 08 '09 at 03:12
BTW, you can also use HttpStatusCode.Redirect (another alias for 302), which is a bit more obvious. – devstuff Sep 08 '09 at 03:14
amended the alias and added 301 as well – Sam Saffron Apr 26 '12 at 05:50
1

Another tweak; can use `response.Headers[HttpResponseHeader.Location]` in your "do something" example as well (analogous to the status code constants). – Matt Enright Jun 20 '12 at 19:26

score 3 · Answer 2 · answered Sep 08 '09 at 00:10

3

Like so:

HttpWebResponse response;
int code = (int) response.StatusCode;

The code should be

HttpStatusCode.TemporaryRedirect

answered Sep 08 '09 at 00:10

Noon Silk

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HttpStatusCode.TemporaryRedirect is a 307. http://www1.cs.columbia.edu/~lok/csharp/refdocs/System.Net/types/HttpStatusCode.html#TemporaryRedirect – Nathan Taylor Sep 08 '09 at 00:34
I can now see the reponse code, but it still redirects and gives me 'OK' – Sep 08 '09 at 00:47
@Nathan Taylor: I copy/pasted what CURL gave me using curl -I "url" – Sep 08 '09 at 00:47

score 1 · Answer 3 · edited Dec 13 '13 at 16:34

VB Net Code

Function GetRealUrl(someUrl As String) As String
        Dim req As HttpWebRequest = TryCast(WebRequest.Create(someUrl), HttpWebRequest)
        req.AllowAutoRedirect = False
        Dim response As HttpWebResponse = TryCast(req.GetResponse(), HttpWebResponse)
        If response.StatusCode = HttpStatusCode.Redirect OrElse response.StatusCode = HttpStatusCode.MovedPermanently Then
            ' Do something...
            Dim newUrl As String = response.Headers("Location")
            getrealurl = newUrl
        Else
            getrealurl = someUrl
        End If
End Function

How do i check for a 302 response? WebRequest

3 Answers3

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