Angular $http POST unable to send data to expressjs

I'm trying to post data from angular to express, however, eachtime I make the post request I get this error.

OPTIONS http://localhost/post/ net::ERR_CONNECTION_REFUSED(anonymous function) @ angular.js:11209s @ angular.js:11002g @ angular.js:10712(anonymous function) @ angular.js:15287m.$eval @ angular.js:16554m.$digest @ angular.js:16372m.$apply @ angular.js:16662(anonymous function) @ angular.js:24283m.event.dispatch @ jquery.js:4670r.handle @ jquery.js:4338
controller.js:29 

and the errorCallback response object is:

Object {data: null, status: -1, config: Object, statusText: ""} 

I did some tweaking looking at other similar questions on SO, like adding header, content-type etc. But no luck there.

What seems to be the problem here. Thanks

Controller.js

word.add = function(){
console.log(word.name );

    $http({
        method:'POST',
        url:'http://localhost/post/',
        data :word.name,
        headers: {'Content-Type': 'application/json'} 
    }).then(function successCallback(response){
        console.log(response);
        console.log("Successful");
    },function errorCallback(response){

        console.log(response);
        console.log("Unsuccessful");
    });     
};

Relevant code excerpt from app.js

 var routes = require('./routes/index');
    app.all('/*', function (request, response, next) {
       response.header("Access-Control-Allow-Origin", "*");
       response.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
        response.header("Access-Control-Allow-Headers", "X-Requested-With, Content-Type");
  next();
});

app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use('/post', routes);

index.js

var express = require('express');
var router = express.Router();
router.post('/post', function(request, response){
    console.log(request.body.name);
    response.send('Reached post');
});

module.exports = router;

Edit: Hi, I've already tried and added the content-type header in my response. Still,It's the same error.

The same code works fine while I use this method to post.

$http.post('/post',{data: word.name}).success(function(response) {
       console.log("success");
      }).error(function(err){
         console.log("failure")
      });