title: use jmeter to load test a site: the url is different every time while running the script
body: <p>I try to test a site with Jmeter and I used its HTTP Proxy sever to make the script.</p>
  
  <p>Actually, the process of this script is 
  <br>1. login
  <br>2. click a link to another page and fill in some info and <strong>click SUBMIT</strong>
  <br>3. logout.</p>
  
  <p>The problem is: everytime I run the script, everything is going well before hitting the SUBMIT button. 'cuz after hitting it, 8 random numbers or letters will be added to the url. So, everytime i run the script, the url is different from the first time that made the script.</p>
  
  <p>Is there anyone has run into kind of question?</p>