HttpWebResponse doesnt throws error when network not available

Geniusg

I am using a HttpWebResponse object to download a file from remote location. The problem is that while going through a loop to download the file, if the network goes off, then the code doesnt throws any exception.
I checked in .Net framework 1.0 and 1.1 and the same problem persists. Though in 2.0, i get an IOException.
Can anyone throw some light on this? i am not sure if there is anything fishy about my code or is this a problem with the frameworks 1.0 and 1.1

Thanks !!
- Gaurav

Geniusg

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do

{

      bytesSize = Response.Read(downBuffer, 0, downBuffer.Length);

      if (bytesSize > 0)

      {

            Local.Write(downBuffer, 0, bytesSize);

            if(!Response.CanRead)

                break;

            if (goPause == true)

            break;

     }

}

while (bytesSize > 0);

If there is no network, the flow hangs on line# 3. I expect an exception.

Plater

I am assuming your Response object is of type NetworkStream? From the .GetResponseStream() function on the HttpWebResponse object?

I am guessing it has something to do with the timeout. I bet the underlying exception to the IOException is that there was a teimout waiting to read. The timeout wasn't added until .NET2.0
You could try checking the DataAvailable property before reading to make surethere is still data there to read

Geniusg

Hi Plater..
Thanks for replying..
The Response object is of type System.IO.Stream. HttpWebResponse.GetResponseStream returns a type of Stream object, which doesnt has DataAvailable property :-(
I have found a workaround for this problem. Inside the loop, I check for bytesSize and if it = -1, i throw an IOException (assuming that network is down). I am testing this piece of code by pulling out the network cable from my system when the while-loop is running. Though this workaround seems to work for now, i am not sure if it a good thing to do !!
Any suggestions from your side?

Thanks !!
- Gaurav

Plater

HttpWebResponse.GetResponseStream returns a stream yes, but the actual data type is NetworkStream. You can type cast it.

HttpWebResponse doesnt throws error when network not available

re: HttpWebResponse doesnt throws error when network not available

re: HttpWebResponse doesnt throws error when network not available

re: HttpWebResponse doesnt throws error when network not available

re: HttpWebResponse doesnt throws error when network not available

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