Status code value after calling the method cl_http_client= receive

Hi,
I am sending a query string to 3rd party via outbound http. Now one of the methods needed in this case is CL_HTTP_CLIENT=>RECEIVE . This method has got 3 exceptions such as communication failure etc. If this method has sy-subrc 0 what does this indicate. If a sy-subrc value of 0 indicates success then why are we again quering the status code value between 200 and 299 . Can it happen that the value of sy-subrc = 0 but the status code value is not between 200 and 299 .
In which cases this situation will occur?
Can anyone elaborate on this.....

Hi i could not solve the problem with abap. We developed another application by using another programming language for this issue.
But i think you should create an instance for authantication. After authantication you should get the cookies .
Then create a new instance for other link and before send and receive methods set cookies ( which you got from authantication session ) for other link in ABAP.
We did not have enough time to solve this in ABAP. Hope you will solve. If you solve please let me know how you have solved.
Here is the code(another programming language), may be it will help you.
req = (HttpWebRequest)WebRequest.Create(@"https://login.xxx.com/authenticate.aspx?userid=xxx&password=xxx");
      req.CookieContainer = cc;
      HttpWebResponse httpResponse = (HttpWebResponse)req.GetResponse();
      HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(@"https://yyy.com/postxml.aspx");
      httpRequest.CookieContainer = cc;
      httpRequest.Method = "POST";
      httpRequest.ContentType = "text/xml";
Edited by: MusaCEBE on Sep 23, 2010 4:34 PM

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please provide a detail description of your errors.

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