How to invalidate session?

[Ashish Kulkarni]

Hi
I am doing the following
HttpClient client = new HttpClient();
PostMethod postMethod = new PostMethod(url);
postMethod.setRequestBody(data);            postMethod.getParams
().setParameter(HttpMethodParams.RETRY_HANDLER,
                   new DefaultHttpMethodRetryHandler(3, false));

int statusCode = client.executeMethod(postMethod);

Now i want to invlidate the session created on server
Normally i would do
request.getSession().invalidate();

How to do it using http client
Ashish