问题描述
我收到错误：System.Net.ProtocolViolationException：当我尝试使用proxy for httpwebrequest时，必须在调用[Begin] GetResponse之前将ContentLength字节写入请求流。在使用代理之前我工作得很好。
Dim req As HttpWebRequest = DirectCast（WebRequest.Create（URL），HttpWebRequest）
'接下来3添加了行，然后遇到错误。
Dim myProxy As New WebProxy（ProxyURL）
myProxy.Credentials = New NetworkCredential（ProxyID，ProxyPwd）
req.Proxy = myProxy
req.KeepAlive = KeepAlive
req.AllowAutoRedirect = AllowAutoRedirect
req.Timeout = requestConnectTimeoutInMs
req.ReadWriteTimeout = requestReadWriteTimeoutInMs
'postData
Dim b As Byte（）= System.Text.Encoding.UTF8.GetBytes（postData）
'POST
req.Method =" POST"
req.UserAgent =" Mozilla / 4.0（兼容; MSIE 7.0; Windows NT 6.1; Trident / 4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4 .0E）"
re q.ContentType =" application / x-www-form-urlencoded"
req.Headers.Add（" Cache-Control"，" no-cache"）
req.Headers.Add（" UA-CPU"，" x86"）
req.Headers.Add（HttpRequestHeader.AcceptLanguage，" en -US"）
req.Headers.Add（HttpRequestHeader.AcceptEncoding，" gzip"）
req.Headers.Add（HttpRequestHeader.AcceptEncoding ，"deflate"）
'Referer
req.Referer = Referer
'发送Cookie
req.Headers.Add（" Cookie"，Cookies）
'发送表单
req .ContentLength = b.Length
req.GetRequestStream.Write（b，0，b.Length）
Dim res As HttpWebResponse = DirectCast（req） .GetResponse（），HttpWebResponse）
返回资金
I received the error :System.Net.ProtocolViolationException: You must write ContentLength bytes to the request stream before calling [Begin]GetResponse when i try to use proxy for httpwebrequest. Everything i working fine before using proxy.
Dim req As HttpWebRequest = DirectCast(WebRequest.Create(URL), HttpWebRequest)
' The next 3 lines was added, after then encountered error.
Dim myProxy As New WebProxy(ProxyURL)
myProxy.Credentials = New NetworkCredential(ProxyID, ProxyPwd)
req.Proxy = myProxy
req.KeepAlive = KeepAlive
req.AllowAutoRedirect = AllowAutoRedirect
req.Timeout = requestConnectTimeoutInMs
req.ReadWriteTimeout = requestReadWriteTimeoutInMs
'postData
Dim b As Byte() = System.Text.Encoding.UTF8.GetBytes(postData)
'POST
req.Method = "POST"
req.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)"
req.ContentType = "application/x-www-form-urlencoded"
req.Headers.Add("Cache-Control", "no-cache")
req.Headers.Add("UA-CPU", "x86")
req.Headers.Add(HttpRequestHeader.AcceptLanguage, "en-US")
req.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip")
req.Headers.Add(HttpRequestHeader.AcceptEncoding, "deflate")
'Referer
req.Referer = Referer
'Send Cookies
req.Headers.Add("Cookie", Cookies)
'send the form
req.ContentLength = b.Length
req.GetRequestStream.Write(b, 0, b.Length)
Dim res As HttpWebResponse = DirectCast(req.GetResponse(), HttpWebResponse)
Return res
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