Displaying infowindow when ajax request is done

<!DOCTYPE html>
<html lang="es">
  <head>
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" href="https://libs.cartodb.com/cartodb.js/v3/3.11/themes/css/cartodb.css" />
    <script src="https://libs.cartocdn.com/cartodb.js/v3/3.11/cartodb.js"></script>
    <style type="text/css">
      html, body, #map {
        height:100%;
        padding: 0;
        margin: 0;
      }
    </style>

</head>
  <body onload="main();">
    <div id="map"></div>

var sql = new cartodb.SQL({ user: 'xavijam' });
      
          cartodb.createVis('map', 'https://team.cartodb.com/api/v2/viz/bb5806ea-1735-11e4-a068-0e230854a1cb/viz.json')
           .on('done', function(vis,layers) {
            var layer = layers[1];
            var infowindow_model = layer.infowindow;
            
            // Disabling layer click binding
            layer.unbind('featureClick');

// Create custom layer featureClick binding
            layer.bind('featureClick', function(ev, latlng, pos, data, layerIndex) {
              console.log("infowindow hidden, loading query...");
              
              // Hide infowindow from the beginning
              infowindow_model.set('visibility', false);

// Simulating an ajax call doing a sql request
              sql.execute("SELECT cartodb_id, iso2, iso3, name, area FROM tm_world_borders_simpl_0_3 WHERE cartodb_id = {{id}}", { id: 6 })
                .done(function(data) {

console.log("Query loaded, infowindow displayed");
                  
                  // Set infowindow position, template, content and visibility
                  infowindow_model.set({
                    latlng: latlng,
                    content:  {
                      fields: [{
                        title: false,
                        value: 'test',
                        index: '0',
                      }],
                      data: data.rows
                    },
                    visibility: true
                  });
                });
            });
  
            infowindow_model.set('template_type', 'underscore');
            infowindow_model.set('template', $('#infowindow_template').html());

});
      }
    </script>
  </body>
</html>

Modified http://libs.cartocdn.com/cartodb.js/v3/3.11/cartodb.js to a secure url

https://libs.cartocdn.com/cartodb.js/v3/3.11/cartodb.js