Re: It is safe to use Abort in HttpWebRequest?

A million of thanks


-----Mensaje original-----
De: Discussion of building .NET applications targeted for the Web
[mailto:DOTNET-WEB@xxxxxxxxxxxxxxxxxxx] En nombre de Ian Griffiths
Enviado el: jueves, 27 de enero de 2005 10:55
Para: DOTNET-WEB@xxxxxxxxxxxxxxxxxxx
Asunto: Re: [DOTNET-WEB] It is safe to use Abort in HttpWebRequest?

You can call the Abort method on HttpWebRequest.  This is completely
different from aborting a thread - they are two different operations. (They
just happen to use the same method name.  For those of you who follow the
whole misnamed 'latent typing' discussion, this is precisely the kind of
reason I dislike the idea of relying on names alone to identify
semantics...)

I thought you were talking about Thread.Abort, since your original question
was:

> I know that is not a good practice to use Abort to kill a
> thread. But What about in HttpwebRequest? It is safe?

The way I read this was "Is it OK to use Thread.Abort in conjunction with
HttpWebRequest?"  But now I've seen your code, I realise this is not what
you meant.

Let me clarify my answer:

It's not OK to use Abort to kill a thread as a way of stopping an
HttpWebRequest.

It IS OK to use the HttpWebRequest.Abort method - this is not the same thing
at all as using Abort to kill a thread.

I hadn't realised you were talking about HttpWebRequest.Abort here, because
you started off by asking about aborting threads, something which is wholly
unrelated to HttpWebRequest.Abort.  Sorry about that.  Your code looks OK to
me.


-- 
Ian Griffiths - DevelopMentor
http://www.interact-sw.co.uk/iangblog/

> -----Original Message-----
> From: Javier Martinez Álvarez
> 
> Thanks Ian, can you give me any clue over how to stop the HttpWebRequest?
> 
> I need to stop the HttpRequest because the timeout has expired, and I need
> to implement the timeout because in the asynchronous HttpRequest there
> isn't
> a implementation timeout.
> 
> Now, my wrong implementation because use Abort is:
> 
> //To set the timeout
> 
> ThreadPool.RegisterWaitForSingleObject (result.AsyncWaitHandle, new
> WaitOrTimerCallback(TimeoutCallback), _httpWebRequest, _timeout, true);
> 
> 
> //To kill the request
> private void TimeoutCallback(object state, bool timedOut)
> {       if (timedOut)
>         {
>                 HttpWebRequest request = state as HttpWebRequest;
>                 if (request != null)
>                 {
>                         request.Abort();
>                         CleanUp();
>                 }
>         }
> }

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