twitter bloodhound engine not working according to twitter-typeahead examples -

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i have been using twitter typeahead quite time easy , convenient remote data. decided upgrade latest version (typeahead.js 0.10.5) use robust bloodhound engine. having quite problem bloodhound, below code used directly https://twitter.github.io/typeahead.js/examples/ prefetch example , code not seem work no matter what.

i assume url calling correct link works fine me , see countries. thing have changed prefetch remote, not work prefetch either. have tried other examples on stackexchange here works suggest calling scripts in header correctly, when change url 1 provided twitter not work. know if using code copied twitter-typeahead examples correctly.

    <div id="prefetch">       <input class="typeahead" type="text" placeholder="countries">     </div> <script type='text/javascript'> $(function() {    var countries = new bloodhound({       datumtokenizer: bloodhound.tokenizers.obj.whitespace('name'),              querytokenizer: bloodhound.tokenizers.whitespace,       limit: 10,       remote: {         // url points json file contains array of country names, see         // https://github.com/twitter/typeahead.js/blob/gh-pages/data/countries.json         url: 'https://github.com/twitter/typeahead.js/blob/gh-pages/data/countries.json',         // json file contains array of strings, bloodhound         // suggestion engine expects javascript objects converts of         // strings         filter: function (list) {           return $.map(list, function (country) {              return {                  name: country                  };              });         }       }     });      // kicks off loading/processing of `local` , `prefetch`     countries.initialize();      // passing in `null` `options` arguments result in default     // options being used     $('#prefetch .typeahead').typeahead(null, {       name: 'countries',       displaykey: 'name',       // `ttadapter` wraps suggestion engine in adapter       // compatible typeahead jquery plugin       source: countries.ttadapter()     }); }); </script>


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