blocks|key|757129|text|+Dim+myProxy+As+New+WebProxy("173.234.249.68:8800",+true)
++++++++Dim+request+As+HttpWebRequest
++++++++Dim+response+As+HttpWebResponse
++++++++Dim+tempCookies+As+New+CookieContainer
++++++++request+=+CType(WebRequest.Create("http://samplewebsite.com"),+HttpWebRequest)
++++++++request.Proxy+=+myProxy
++++++++request.ContentType+=+"application/x-www-form-urlencoded"
++++++++request.ContentLength+=+POST.Length
++++++++request.KeepAlive+=+True
++++++++request.CookieContainer+=+tempCookies

++++++++response+=+CType(request.GetResponse(),+HttpWebResponse)
++++++++tempCookies.Add(response.Cookies)
++++++++response.Close()|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|757130|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> Dim myProxy As New WebProxy("173.234.249.68:8800", true)
 Dim request As HttpWebRequest
 Dim response As HttpWebResponse
 Dim tempCookies As New CookieContainer
 request = CType(WebRequest.Create("http://samplewebsite.com"), HttpWebRequest)
 request.Proxy = myProxy
 request.ContentType = "application/x-www-form-urlencoded"
 request.ContentLength = POST.Length
 request.KeepAlive = True
 request.CookieContainer = tempCookies

 response = CType(request.GetResponse(), HttpWebResponse)
 tempCookies.Add(response.Cookies)
 response.Close()
</code></pre>

blocks|key|762520|text|<Runtime.InteropServices.DllImport("wininet.dll",+SetLastError:=True)>+_
Private+Shared+Function+InternetSetOption(ByVal+hInternet+As+IntPtr,+ByVal+dwOption+As+Integer,+ByVal+lpBuffer+As+IntPtr,+ByVal+lpdwBufferLength+As+Integer)+As+Boolean
End+Function


Public+Structure+Struct_INTERNET_PROXY_INFO
++++Public+dwAccessType+As+Integer
++++Public+proxy+As+IntPtr
++++Public+proxyBypass+As+IntPtr
End+Structure

Private+Sub+UseProxy(ByVal+strProxy+As+String)
++++Const+INTERNET_OPTION_PROXY+As+Integer+=+38
++++Const+INTERNET_OPEN_TYPE_PROXY+As+Integer+=+3

++++Dim+struct_IPI+As+Struct_INTERNET_PROXY_INFO

++++struct_IPI.dwAccessType+=+INTERNET_OPEN_TYPE_PROXY
++++struct_IPI.proxy+=+Marshal.StringToHGlobalAnsi(strProxy)
++++struct_IPI.proxyBypass+=+Marshal.StringToHGlobalAnsi("local")

++++Dim+intptrStruct+As+IntPtr+=+Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI))

++++Marshal.StructureToPtr(struct_IPI,+intptrStruct,+True)

++++Dim+iReturn+As+Boolean+=+InternetSetOption(IntPtr.Zero,+INTERNET_OPTION_PROXY,+intptrStruct,+System.Runtime.InteropServices.Marshal.SizeOf(struct_IPI))
End+Sub

Private+Sub+Button1_Click(ByVal+sender+As+System.Object,+ByVal+e+As+System.EventArgs)+Handles+Button1.Click
++++Label4.Text+=+(TextBox1.Text+&+":"+&+TextBox2.Text)

End+Sub

Private+Sub+Button2_Click(ByVal+sender+As+System.Object,+ByVal+e+As+System.EventArgs)+Handles+Button2.Click
++++UseProxy(Label4.Text)
++++WebBrowser1.Navigate(TextBox3.Text)
End+Sub|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|762521|结束类|unstyled|762522|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>&lt;Runtime.InteropServices.DllImport("wininet.dll", SetLastError:=True)&gt; _
Private Shared Function InternetSetOption(ByVal hInternet As IntPtr, ByVal dwOption As Integer, ByVal lpBuffer As IntPtr, ByVal lpdwBufferLength As Integer) As Boolean
End Function


Public Structure Struct_INTERNET_PROXY_INFO
 Public dwAccessType As Integer
 Public proxy As IntPtr
 Public proxyBypass As IntPtr
End Structure

Private Sub UseProxy(ByVal strProxy As String)
 Const INTERNET_OPTION_PROXY As Integer = 38
 Const INTERNET_OPEN_TYPE_PROXY As Integer = 3

 Dim struct_IPI As Struct_INTERNET_PROXY_INFO

 struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY
 struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy)
 struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local")

 Dim intptrStruct As IntPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI))

 Marshal.StructureToPtr(struct_IPI, intptrStruct, True)

 Dim iReturn As Boolean = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, System.Runtime.InteropServices.Marshal.SizeOf(struct_IPI))
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
 Label4.Text = (TextBox1.Text &amp; ":" &amp; TextBox2.Text)

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
 UseProxy(Label4.Text)
 WebBrowser1.Navigate(TextBox3.Text)
End Sub
</code></pre>

End Class

blocks|key|99078|text|Cahnge的台词：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99079|Dim+myProxy+As+New+WebProxy("173.234.249.68",+8800)|code-block|syntax|javascript|99080|至|99081|Dim+myProxy+As+New+WebProxy("173.234.249.68:8800")|99082|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Cahnge the line:

<pre><code>Dim myProxy As New WebProxy("173.234.249.68", 8800)
</code></pre>

To 

<pre><code>Dim myProxy As New WebProxy("173.234.249.68:8800")
</code></pre>

my code works when i am not using a proxy but i want to use a proxy so that my real IP is not revealed when sending a request. Whenever i try to run my program it gives me an error saying "The remote server returned an error: (417) Expectation Failed." and it is pointing at "response = CType(request.GetResponse(), HttpWebResponse)". Is there something wrong with my code? I am really confused right now. Any help will do thanks.

<pre><code> Dim myProxy As New WebProxy("173.234.249.68", 8800)
 Dim request As HttpWebRequest
 Dim response As HttpWebResponse
 Dim tempCookies As New CookieContainer
 request = CType(WebRequest.Create("http://samplewebsite.com"), HttpWebRequest)
 request.Proxy = myProxy
 request.ContentType = "application/x-www-form-urlencoded"
 request.ContentLength = POST.Length
 request.KeepAlive = True
 request.CookieContainer = tempCookies

 response = CType(request.GetResponse(), HttpWebResponse)
 tempCookies.Add(response.Cookies)
 response.Close()
</code></pre>

VB.net HttpWebRequest with Proxy

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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当我不使用代理，但我想使用代理，以便在发送请求时不会暴露我的真实IP时，我的代码可以正常工作。每当我尝试运行我的程序时，它都会给我一个错误，说"The remote server returned an error：(417) error“。它指向"response = CType(request.GetRespons...

问带代理的VB.net HttpWebRequest
EN

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问带代理的VB.net HttpWebRequestEN