.net - 如何检查 302 响应？网络请求

Question

使用WebRequestI want to know if I get a

《302临时搬家》

响应而不是自动获取新的 url。

Answer 1

如果您想检测重定向响应，而不是跟随它自动创建WebRequest并将AllowAutoRedirect属性设置为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"];
}

Answer 2

像这样：

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

代码应该是

HttpStatusCode.TemporaryRedirect

Answer 3

VB网络代码

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