VB.net HttpWebRequest 超时

问：

我在使用HttpClient时遇到了一些问题。 我计划提出几个 Web 请求，主要是 GET 和 POST。 几年前，我能够毫无顾虑地做到这一点，在那里我想再次做一个小项目，只是它不再起作用了：程序冻结（因为它不是异步的，但我并不真正关心这一点）并给我发送超时。 在那里，我使用的是 HttpClient，据我所知，它比 HttpWebRequest 更安全，因为在此之前我使用的是 HttpWebRequest。 所以代码问题或其他，我真的不知道.. 我尝试了几个主机，但一直都是一样的。 在那里，测试是用 youtube 进行的。它必须向我展示答案，所以页面的源代码在逻辑上。

以下是使用的代码：

Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    MsgBox(WRequest("https://www.youtube.com/", "GET", ""))
    'WRequest("http://", "POST", "name=jane&stat=active")
End Sub
Function WRequest(URL As String, method As String, POSTdata As String) As String
    Dim responseData As String = ""
    Try
        Dim cookieJar As New Net.CookieContainer()
        Dim hwrequest As Net.HttpWebRequest = Net.WebRequest.Create(URL)
        hwrequest.CookieContainer = cookieJar
        hwrequest.Accept = "*/*"
        hwrequest.AllowAutoRedirect = True
        hwrequest.UserAgent = "http_requester/0.1"
        hwrequest.Timeout = 600
        hwrequest.Method = method
        If hwrequest.Method = "POST" Then
            hwrequest.ContentType = "application/x-www-form-urlencoded"
            Dim encoding As New Text.ASCIIEncoding() 'Use UTF8Encoding for XML requests
            Dim postByteArray() As Byte = encoding.GetBytes(POSTdata)
            hwrequest.ContentLength = postByteArray.Length
            Dim postStream As IO.Stream = hwrequest.GetRequestStream()
            postStream.Write(postByteArray, 0, postByteArray.Length)
            postStream.Close()
        End If
        Dim hwresponse As Net.HttpWebResponse = hwrequest.GetResponse()
        If hwresponse.StatusCode = Net.HttpStatusCode.OK Then
            Dim responseStream As IO.StreamReader =
              New IO.StreamReader(hwresponse.GetResponseStream())
            responseData = responseStream.ReadToEnd()
        End If
        hwresponse.Close()
    Catch e As Exception
        responseData = "An error occurred: " & e.Message
    End Try
    Return responseData
End Function 
End Class