title: Cost of HTTP Call for Angular 2 + PHP app
body: <p>I'm implementing server side session in PHP + Angular 2 Application and this is my plan:</p>
  
  <ol>
  <li>Creating a table session_info in MySQL and it returns unique session id.</li>
  <li>To make sure session is valid every time state changes i.e new route is picked </li>
  </ol>
  
  <p>I am making an HTTP call to check session is valid or not in ngInit for each component but I'm concerned about the cost of making an HTTP call on every ngInit. Is this right way of doing this ?</p>