判断URL的HTTP状态

Public Class TestExist
Public Shared Function UrlExist( ByVal sURL As String ) As Boolean
Dim temp As Boolean = False

Try
Dim request As HttpWebRequest = DirectCast (WebRequest.Create(sURL), HttpWebRequest)
' WebProxy proxy = new WebProxy("your proxy server", 8080);
' request.Proxy = proxy;
request.Method = " HEAD "
request.AllowAutoRedirect = False
Dim response As HttpWebResponse = DirectCast (request.GetResponse(), HttpWebResponse)


Select Case response.StatusCode
Case HttpStatusCode.OK
temp = True
Exit Select
Case HttpStatusCode.Moved
temp = True
Exit Select
Case HttpStatusCode.NotFound
temp = False
Exit Select
Case HttpStatusCode.MultipleChoices
temp = True
Exit Select
Case HttpStatusCode.Ambiguous
temp = True
Exit Select
Case HttpStatusCode.MovedPermanently
temp = True
Exit Select
Case HttpStatusCode.Moved
temp = True
Exit Select
Case HttpStatusCode.Found
temp = True
Exit Select
Case HttpStatusCode.Redirect
temp = True
Exit Select
Case HttpStatusCode.SeeOther
temp = True
Exit Select
Case HttpStatusCode.RedirectMethod
temp = True
Exit Select
Case HttpStatusCode.NotModified
temp = True
Exit Select
Case HttpStatusCode.UseProxy
temp = True
Exit Select
Case HttpStatusCode.Unused
temp = True
Exit Select
Case HttpStatusCode.TemporaryRedirect
temp = True
Exit Select
Case HttpStatusCode.RedirectKeepVerb
temp = True
Exit Select
Case Else
temp = False
End Select
response.Close()
Catch ex As Exception
temp = False
End Try

Return temp
End Function
End Class