title: Jmeter : Application uses _session_id in cookie to maintain session. It is being maintained from login to logout. I need to correlate it
body: <p>Jmeter : Application uses _session_id in cookie to maintain session.
  It is visible in get request. It is being maintained from the time of login till logout. I need to correlate it to test the performance.</p>
  
  <p>I have used regex extractor to extract the _session_id as below: <br/>
  In regular expression <strong>_session_id=(\w+) <br/></strong>
  specified <strong>template as $1$</strong></p>
  
  <p>and in regex user parameters "tSess" I have specified as parameter name regex group number as 1 and parameter value regex group number as 1.</p>
  
  <p>I have used HTTP cookie manager with _session_id name and value as tSess.</p>
  
  <p>I ran the script but I found that _session_id is appended in post data and it is empty like "_session_id=", nothing after "=".</p>
  
  <p>I was also using HTTP URL re-writing modifier so above was occuring but I have removed it and now there is no _session_id appended in post data.</p>
  
  <p>How can I correlate.</p>
  
  <p>Application is in ruby. </p>