title: Warning XMLHttpRequest to ejecute ajax
body: <p>Hi everyone I try to execute this request</p>
  
  <pre><code>var post_url = "https://www.googleapis.com/books/v1/volumes?q=isbn:0716604892";
                  var text_area = $('#isbn_textarea').val().trim();
                    $.ajax({
                    dataType: 'json',
                    url: post_url,
                    type: 'GET',
                      success: function(response) {
                        var out = "";
                        alert(response);
                      }, 
                      error: function(response) {
                          alert('mal');
                      }
  
                  })
  </code></pre>
  
  <p>But I obtain this  warning</p>
  
  <pre><code>Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.
  </code></pre>
  
  <p>any idea?
  Thanks in advance!</p>