HttpWebRequest reuse problems

[matadon]

Hi,

I am writing a C# app. I have a finite (~50) set of URLs that I am continuously polling in a circular manner. I would like to do this in a way that can send out each of the requests and get responses as quickly as possible, then do it again.

For my last attempt, I tried implementing a circular queue of precreated HttpWebRequest objects, then creating a HttpWebResponse , StreamReader, and Stream and disposing of them after usage.

My problem is, when I reach the beginning of the queue the second time, I get an exception stating that the "Stream is not readable". It looks like I am not currently able to reuse a HttpWebRequest, at least with out doing something differently. Is it possible to reissue a HttpWebRequest that has already been issued?

I am aware I can do things like async stuff and multithreading to speed things up, but I would really like to understand why this code doesn't work. I also know that I could create a new HttpWebRequest each time, but I did that previously and ran out of ephemeral ports in Windows - so I would like to use the same set of ports if possible.

Also, do you know of any way to determine if a website (yahoo, for example) confirms to the HTTP recommended maximum number of 2 simultaneous connections?

The code looks roughly as follows:
forever{
HttpWebRequest objRequest = urlQueue.GetNex tUrl();
//(objRequest.Kee pAlive = true;)
//(objRequest.Pro xy = WebProxy.GetDef aultProxy();)
//(objRequest.Tim eout = 2000;)
try
{
WebResponse objResponse;
objResponse = objRequest.GetR esponse();

Stream stream = objResponse.Get ResponseStream( );
StreamReader sr = new StreamReader(st ream);
string result = sr.ReadToEnd();
sr.Close();
objResponse.Clo se();
stream.Close();
} catch{}
}

Thanks in advance!!

[kenobewan]

You may need to clear the objResponse object. I assume that forever is a function name. Code is never 'roughly' anything, please provide annotation remarks if editing. Thanks.

[matadon]

Thanks for the reply!

forever = while(!done)

Could you expand on what you mean by clearing the objResponse? Thanks!

[jallred]

Hi,

I am writing a C# app. I have a finite (~50) set of URLs that I am continuously polling in a circular manner. I would like to do this in a way that can send out each of the requests and get responses as quickly as possible, then do it again.

<...>

Thanks in advance!!

See the code at http://www.thescripts. com/forum/showthread.php? p=3075511#post3 075511 for a more typical use of HttpWebRequest.

John
http://blogs.msdn.com/usisvde/