title: how to send ajax request in jQuery with data encoded
body: <p>when i send ajax request i got the error that</p>
  
  <pre><code> $.ajax({
                          type: "POST",
                          url: furl2,
                          cache: false,
                          contentType: "application/json;charset=utf-8",
                          data: { id: id, url: $("#id" + id + " .customURL").val() },
                          success: function (msg) {
                            //some code here
                          },
                      });
                  }
  </code></pre>
  
  <p>i got the error that id is undefined even i put them.</p>
  
  <p>how i can send a ajax request to server using ajax.</p>