java android, how to send session accept?

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Java

Mobile

Android

I need to send a post, but the server check if the post have accepting for session,
what is the code who i need to attach?

It's part of my post code:

StringEntity entity = new StringEntity(xmlSend, "UTF-8");
DefaultHttpClient httpClient = new DefaultHttpClient();

HttpPost post = new HttpPost(watchUrl);
post.addHeader(" * ", " * ");
post.setEntity(entity);

HttpResponse response = httpClient.execute(post);

if(response != null) {
    InputStream inputstream = response.getEntity().getContent();
    String xmlGet = StmToStr(inputstream);          
}

Thanks for helpers...