urlcollection.url or collection.url() 
 Set the url property (or function) on a collection to reference its location on the server. Models within the collection will use url to construct URLs of their own. 
var Notes = Backbone.Collection.extend({
  url: '/notes'
});
// Or, something more sophisticated:
var Notes = Backbone.Collection.extend({
  url: function() {
    return this.document.url() + '/notes';
  }
});
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