[CORS]跨域请求只支持协议方案:http, data, chrome, chrome-extension, http

我知道有很多解释，但它仍然不能解决我目前的问题。基本上，我使用的是/sth和' '/stheelse to render into my index.html (which is/')，因为一个是post另一个是comments，我确实在服务器中包含了header，但是但是我仍然得到了一个错误说:

XMLHttpRequest不能加载文件:///跨域请求只支持协议方案:http, data, chrome, chrome-extension, https, chrome-extension-resource。"

    //client jquery ajax
    function something(){
      $.ajax({
        method: 'GET',
        url: '/sth',
        headers: headers,
        success: function(data) {
          console.log(data);
        }
      });
    }
    function somethingElse(){
  $.ajax({
    method: 'GET',
    url: '/sthElse',
    success: function(data) {
      console.log('comment',data);
        }
      }
    }
  });
}
    // server express
    app.use(function(req, res, next) {
      res.header('Access-Control-Allow-Origin', 'example.com');
      res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
      res.header('Access-Control-Allow-Headers', 'Content-Type');
      next();
    });
    app.get('/sth', function(request, response){
      var req = http.get(url+"posts", function(res){
        console.log('STATUS: ' + res.statusCode);
        console.log('HEADERS: ' + JSON.stringify(res.headers));
        var bodyChunks = [];
        res.on('data', function(chunk) {
          bodyChunks.push(chunk);
        })
        .on('end', function() {
          var body = Buffer.concat(bodyChunks);
          response.send(JSON.parse(body));
        })
      });
      req.on('error', function(e) {
        console.log('ERROR');
      });
    });
app.get('/sthElse', function(request, response){
  console.log('STATUSasdf: ' + response.statusCode);
  var req = http.get(url+'comments', function(res) {
    var bodyChunks = [];
    res.on('data', function (chunk) {
      bodyChunks.push(chunk);
    })
    .on('end', function() {
      console.log('this is bodychunks pre decription', bodyChunks);
      var body = Buffer.concat(bodyChunks);
      response.send(JSON.parse(body));
    })
  });
  req.on('error', function(e) {
    console.log('problem with request: ' + e.message);
  });
});