发生了IOException ReadtoEnd vb.net

Question

当我使用HttpWebRequest和代理启动我的程序时遇到此问题，请帮助

这是我的代码：

                Using response = req.GetResponse()
                    If response.ContentLength <> 0 Then
                        Using stream As Stream = response.GetResponseStream()
                            Dim page_code_1 As String = ""
                            Using reader = New StreamReader(stream)
                                page_code_1 = reader.ReadToEnd
                                reader.Close()
                                reader.Dispose()
                                stream.Close()
                            End Using
                        End Using
                    End If
                End Using