Bluemix Cors disable Node.js - angularjs

Question

I am not able to avoid this error on my browser - XMLHttpRequest cannot load https://xyz.mybluemix.net/get_user_byId.Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://a.x.y.z:9000' is therefore not allowed access. The response had HTTP status code 404.
I am using every measure required to actually allow cross origin calls, but still it gives me an error.
var app = express();
var cors = require('cors');
app.use(cors());
app.use(function(request, response, next) {
response.header("Access-Control-Allow-Origin", "*");
response.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
response.header("Access-Control-Allow-Methods", "GET, POST, PUT");
next();
});
app.get('/get_users', cors(), function(req, res) {...}
I am calling this api like - (standard $http angular way)
return $http.post(base+"get_user_byId", id)

Answer 1

You need only:
var cors = require('cors'); //Importing this middleware enables CORS
and
app.use(cors());
to allow CORS in express/connect applications
Delete these lines:
app.use(function(request, response, next) {
response.header("Access-Control-Allow-Origin", "*");
response.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
response.header("Access-Control-Allow-Methods", "GET, POST, PUT");
next();
});
and set your GET API with:
app.get('/get_users', function(req, res) {...}
Reference - Enable all CORS: https://www.npmjs.com/package/cors#simple-usage-enable-all-cors-requests
In angularJS you have to call that API with GET method (no post) because you have defined /get_users api with get method.
I suggest you to use this snippet:
var par = {
id: myId,
};
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope, $http) {
$http({
method : "GET",
params: par,
url : base + "/get_users"
}).then(function mySucces(response) {
$scope.myData = response.data;
}, function myError(response) {
$scope.myData = response.statusText;
});
});