Problem with WebRequest and timeout

  • Thread starter news.microsoft.com
  • Start date
N

news.microsoft.com

Hello

I try to implement "retry" if connection to web ends with "time out". I want
to give a chance to prolong waiting for response. The following code is
taken from WebRequest.GetResponse() implementation. All I need to do is to
modify line with "to change". My client uses derrived HttpWebRequest. I
tried to implement new class MyHttpWebRequest and override GetResponse for
it, but how can I create instance of this class. In .Net there is used
special interface IWebRequestCreate and static method Create to creating
WebResponse object but I still don't know how to do this. Could somebody
help me? (maybee there is another solution?). Thanks a lot.

Shark

public override WebResponse GetResponse()
{
IAsyncResult result1;
Exception exception1;
if (this._HaveResponse)
{
this.CheckFinalStatus();
if (this._HttpResponse != null)
{
return this._HttpResponse;
}

}
result1 = base.BeginGetResponse(null, null);
if ((this._Timeout != -1) && !result1.IsCompleted)
{
try
{
result1.AsyncWaitHandle.WaitOne(this._Timeout, 0); //to change
if (!result1.IsCompleted)
{
base.Abort();
throw new WebException(SR.GetString("net_timeout"), 14);

}
}
catch (Exception exception2)
{
exception1 = exception2;
base.Abort();
throw;

}
 
J

Joerg Jooss

news.microsoft.com said:
Hello

I try to implement "retry" if connection to web ends with "time out".
I want to give a chance to prolong waiting for response. The
following code is taken from WebRequest.GetResponse() implementation.
All I need to do is to modify line with "to change".
Click to expand...

Hm...

result1.AsyncWaitHandle.WaitOne(this._Timeout, 0); //to change

The second parameter is false, not 0. As you can see, it already uses a
timeout, so there's no reason to toy with HttpWebRequest's innards ;-)
Just use the HttpWebRequest.Timeout property.
My client uses
derrived HttpWebRequest. I tried to implement new class
MyHttpWebRequest and override GetResponse for it, but how can I
create instance of this class. In .Net there is used special
interface IWebRequestCreate and static method Create to creating
WebResponse object but I still don't know how to do this. Could
somebody help me? (maybee there is another solution?). Thanks a lot.
Click to expand...

You can also use the asynchronous BeginGetResponse(), which returns an
IAsyncResult object to create an timeout that is independent of the Timeout
property mentioned above. This looks roughly like this:

HttpWebRequest request =
(HttpWebRequest) WebRequest.Create(http://host/path/to/resource.html);

IAsynchResult ar = request.BeginGetResponse(
new AsyncCallback(ResponseCallback),
request);

ThreadPool.RegisterWaitForSingleObject(
ar.AsyncWaitHandle,
new WaitOrTimerCallback(TimeoutCallback),
request,
5000, // 5 secs
true);

Cheers,
 
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