title: How to get Form/Post Parameter when it posted?
body: <p>I am trying to get Form/Post Parameters from the page when my client HTTP post the data. I don't know how to retrieve when client posts data and wait for the data in the page. 
  In below example <code>checkin</code> and <code>user</code> are parameters. </p>
  
  <p>Do I need to write any listener for this? How to read the Form/Post Parameters from in my page?</p>