Web Request hangup

This is very frustrating and I believe it to be a bug in the framework. We have tried everything we can think of to fix this and it happens consistently.

This statement in the below code:

Dim WebResp as HTTPWebResponse = DirectCast WebReq.GetResponse(), HttpWebResponse)

That statement will hang every single time if the user closes or clicks back on the browser and tries the button click again. It will work the first time, but hangs until timeout in subsequent attempts. Every time. Closing the streams, etc. doesn't fix it. This happens on multiple machines and platforms as well as Framework 1.1 and 2.

'Build Web Request

Dim WebReq As HttpWebRequest = DirectCast(WebRequest.Create(strPage), HttpWebRequest)
'Authentication

Dim auth As String = "xxxxxxxxxxxxxxxf"Dim authBytes As Byte() = Encoding.UTF8.GetBytes(auth.ToCharArray())
WebReq.Headers("Authorization") = "Basic " & Convert.ToBase64String(authBytes)

'Our method is post, otherwise the buffer (postvars) would be useless

WebReq.Method = "POST"

'We use form contentType, for the postvars.

WebReq.ContentType = "application/x-www-form-urlencoded"

'The length of the buffer (postvars) is used as contentlength.

WebReq.ContentLength = buffer.Length

'We open a stream for writing the postvars

Dim PostData As Stream = WebReq.GetRequestStream() *** hangs here ***
'Now we write, and afterwards, we close. Closing is always important!

PostData.Write(buffer, 0, buffer.Length)

' Close the Stream

PostData.Close()

'Get the response handle, we have no true response yet!

Dim WebResp As HttpWebResponse = DirectCast(WebReq.GetResponse(), HttpWebResponse)
Dim strResponse As String

strResponse = WebResp.StatusCode

Dim streamResponse As Stream = WebResp.GetResponseStream()
Dim streamRead As New StreamReader(streamResponse)

Dim responseString As String

responseString = streamRead.ReadLine

streamResponse.Close()

streamRead.Close()

WebResp.Close()

streamResponse = Nothing

streamRead = Nothing

WebResp = Nothing

GC.Collect()

' The Following code gets the return variables into pairs

Dim rPairs As New NameValueCollection
Dim pairs As String() = responseString.Split("&"c)

For Each pair As String In pairsDim values As String() = pair.Split("="c)
rPairs.Add(values(0), values(1))

Next

If strResponse = HttpStatusCode.OK Then

If rPairs("response_code") = "1" Then

' Collect Garbage and see if that will end the session

GC.Collect()

HttpContext.Current.Response.Redirect(rPairs("cons umer_url"))

rPairs = Nothing

HttpContext.Current.Response.Close()

HttpContext.Current.Response.End()

Return True

Else

'Tools.EventLogger.LogEvent((rPairs("response_code ") & ":") + rPairs("response_msg"), EventLogEntryType.[Error])

HttpContext.Current.Response.Write("Status1 Code: " & WebResp.StatusCode)

Return False

End If

terpanther

[terpanther]

I put *** hangs here *** on the wrong line of code. It actually hangs the second time through on the GetReponse line.

terpanther