title: Understanding JSessionId across multiple domains
body: <p>I'm trying to understand the uniqueness and scope of a JSessionId, as it relates across multiple, unreleated domains.</p>
  
  <p>I've read <a href="https://stackoverflow.com/questions/595872/under-what-conditions-is-a-jsessionid-created">Under what conditions is a JSESSIONID created?</a>, and still have some questions -- </p>
  
  <p>Specifically:</p>
  
  <p>If a user visits <code>www.app1.com</code>, and that app makes a call to <code>www.app2.com</code> to load data, are two jsessionId's created - one for each domain?</p>
  
  <p>Likewise, when the call goes out to <code>www.app2.com</code>, is any information about the jsessionid from <code>www.app1.com</code> passed along?</p>
  
  <p>What impact do redirects have on this?  (Eg., requesting <code>http://app1.com/login.jsp</code> redirects to <code>http://app2.com/login.jsp</code>)</p>