title: doGet calls doPost OR vise versa
body: <p>I've bring this example from a book:</p>
  
  <pre><code>protected void doPost(HttpServletRequest req, HttpServletResponse resp)
  throws ServletException, IOException
    ServletOutputStream out = resp.getOutputStream();
    out.setContentType(“text/html”);
    out.println("&lt;html&gt;&lt;h1&gt;Output to Browser&lt;/h1&gt;");
    out.println("&lt;body&gt;Written as html from a Servlet&lt;body&gt;&lt;/html&gt;");
  }
  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
  throws ServletException, IOException
    doPost(req, resp); //call doPost() for flow control logic.
  }
  </code></pre>
  
  <p><em><strong>Questions:</em></strong></p>
  
  <ol>
  <li><em>Why <code>doPost</code> can't call <code>doGet</code>?</em></li>
  <li><em>What does <code>flow control</code> mean?</em></li>
  </ol>