title: Join 2 webservices in client side or server side
body: <p>I am working as service developer.</p>
  
  <p>My web-service have support 2 method: get a student by student id and get class by student id.
  Web UI actually need a data that is a student with class information embedded in.</p>
  
  <p>So  I need to query student by id then keep in student variable, then query class by student id then classbyStudent. Then try to embed the class variable to the student variable.</p>
  
  <p>So Where I should write these code above?<br>
  Should I write a third service to serve the student with class information?
  Or leave it for client-side (angular Js)</p>