JSP/Servlet How to identify if the HTTP request came from an ajax request

Question

I am using JQuery-Ajax, and History.js for my web app, is there anyway I can identify if the request came from an AJAX request or just normal request? What I aim to do is something like this

<%if(isRequestAjax()){%>
<jsp:include page="/views/header.jsp" />        
}
<%}%>

<div id ="profilePage>
    <!-- user profile will be loaded here !-->
</div>

I am also using Struts2 as may MVC framework

Answer 1

You have to check for a request header X-Requested-With it will be XMLHttpRequest

  if ("XMLHttpRequest".equals(req.getHeader("X-Requested-With")) ){
           // include other file
  }