Hang when call releaseConnection()

Hi, experts:
At server side, it sends the following HTTP message to a client:
=======================================
GET /Inform?c=testing HTTP/1.1
User-Agent: Jakarta Commons-HttpClient/3.1-rc1
Host: 140.92.63.241:8000
=======================================
The, the client responses to this
=======================================
HTTP/1.1 202 ACCEPTED
Server: gSOAP/2.7
Content-Type: text/xml; charset=utf-8
Content-Length: 0
Connection: close
Set-Cookie: visit=true;Domain=localhost;Path=/;Version=1;Max-Age=600
=======================================
At this time , the server calls releaseConnection method. But the connection isn't closed immediately.
The code is in "attach code snippet".
But I see that it hangs a while in releaseConnection() method. And I  use a debuger to trace what's the problem. And I see that releaseConnetion seems to wait something.  
How to let the connection close immediately?
Thank you.
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{
// Send GET /Inform?c=testing HTTP/1.1 ... message
int statusCode = httpClient.executeMethod(httpGetMethod);
// Get the response
if (statusCode == HttpStatus.SC_OK)
{
	returnValue = true;
}
else
{
	logger.warn("Authentication of Trigger CPE is failure !!\nStatus Code = " + statusCode + "\nDescription: " + httpGetMethod.getStatusLine());
}
 
}
catch (Exception e)
{
	logger.error("", e);
}
finally
{
	// release any connection resources used by the method
	httpGetMethod.releaseConnection();
	return returnValue;
}
httpGetMethod.releaseConnection();