代理错误：System.Net.ProtocolViolationException [英] Proxy Error: System.Net.ProtocolViolationException
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
我遇到以下异常：
System.Net.ProtocolViolationException：在
调用[Begin] GetResponse之前，必须将ContentLength字节写入请求流。
在System.Net.HttpWebRequest.GetResponse（）
在Proxy.Form1.Form1_Load（对象发件人，EventArgs e）
以下代码在没有代理的情况下工作。我曾尝试过询问但无济于事。可以
有人可以解决问题吗？
Dim stream As Stream = Nothing
Dim Str As String = String.Empty
Dim policy As HttpRequestCachePolicy = New HttpRequestCachePolicy（ HttpRequestCacheLevel.Default）
HttpWebRequest.DefaultCachePolicy = policy
Dim url As String =" http：//www.jj919.com/post.asp"
Dim req As HttpWebRequest = DirectCast（WebRequest.Create（URL），HttpWebRequest）
Dim noCachePolicy As HttpRequestCachePolicy = New HttpRequestCachePolicy（HttpRequestCacheLevel.NoCacheNoStore）
req。 CachePolicy = noCachePolicy
req.KeepAlive = True
req.AllowAutoRedirect = True
req.Timeout = 3000
req.ReadWriteTimeout = 3000
Dim p As新的WebProxy（）
Dim pUri As New Uri（" http：//202.75.43.20:808&)\"b $ b p.Address = pUri
p.Credentials = New NetworkCredential（" test&qu ot;，" test"）
req.Proxy = p
Dim postData As String = String.Format（" name = {0}"，" sam"）
Dim b As Byte（）= System.Text.Encoding.UTF8.GetBytes（postData）
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）"
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"）
req.ContentLength = b.Length
尝试
req.GetRequestStream.Write（b，0，b.Length）
使用res As HttpWebResponse = DirectCast（req.GetResponse（），HttpWebResponse）
If（not res.Headers.Get（" Content-Encoding"）Is Nothing）then
stream = New GZipStream（res.GetResponseStream，CompressionMode.Decompress）
Else
stream = res.GetResponseStream（）
End if
使用sr As StreamReader = New System.IO.StreamReader（stream，Encoding.Default）
Console.WriteLine（sr.ReadToEnd）
End using
End using
Catch wex As Exception
Console.WriteLine（wex.T oString）
结束尝试
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
I encountered the following exception:
System.Net.ProtocolViolationException: You must write ContentLength bytes to the request stream before calling [Begin]GetResponse.
at System.Net.HttpWebRequest.GetResponse()
at Proxy.Form1.Form1_Load(Object sender, EventArgs e) in
The following code works without proxy. I had tried asking around but to no avail. Can somebody shed a light?
Dim stream As Stream = Nothing Dim Str As String = String.Empty Dim policy As HttpRequestCachePolicy = New HttpRequestCachePolicy(HttpRequestCacheLevel.Default) HttpWebRequest.DefaultCachePolicy = policy Dim url As String = "http://www.jj919.com/post.asp" Dim req As HttpWebRequest = DirectCast(WebRequest.Create(URL), HttpWebRequest) Dim noCachePolicy As HttpRequestCachePolicy = New HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore) req.CachePolicy = noCachePolicy req.KeepAlive = True req.AllowAutoRedirect = True req.Timeout = 3000 req.ReadWriteTimeout = 3000 Dim p As New WebProxy() Dim pUri As New Uri("http://202.75.43.20:808") p.Address = pUri p.Credentials = New NetworkCredential("test", "test") req.Proxy = p Dim postData As String = String.Format("name={0}", "sam") Dim b As Byte() = System.Text.Encoding.UTF8.GetBytes(postData) 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") req.ContentLength = b.Length Try req.GetRequestStream.Write(b, 0, b.Length) Using res As HttpWebResponse = DirectCast(req.GetResponse(), HttpWebResponse) If (Not res.Headers.Get("Content-Encoding") Is Nothing) Then stream = New GZipStream(res.GetResponseStream, CompressionMode.Decompress) Else stream = res.GetResponseStream() End If Using sr As StreamReader = New System.IO.StreamReader(stream, Encoding.Default) Console.WriteLine(sr.ReadToEnd) End Using End Using Catch wex As Exception Console.WriteLine(wex.ToString) End Try
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