Angular $http.post returnd empty error - angularjs

Question

I am using angular JS to send some data to nodejs server.
When I use, curl, I get back the data I send (correct result):
curl -d '{"MyKey":"My Value"}' -H "Content-Type: application/json" 'http://127.0.0.1:3000/s?table=register_rings&uid=1'
> {"MyKey":"My Value"}
However, when I use angularjs service, error occures.
.factory('RegisterRingsService', function($http, $q) {
// send POST request with data and alert received
function send(data, uid) {
$http({
method: 'POST',
url: 'http://127.0.0.1:3000/s?table=register_rings&uid=1',
data: '{"MyKey":"My Value"}',
headers: { "Content-Type": "application/json", "Access-Control-Allow-Origin":"*"},
responseType: 'json'
}).success(function(data, status, headers, config) {
alert('success', data, status);
}).error(function(data, status, headers, config) {
alert('error' + JSON.stringify(data) + JSON.stringify(status));
}).catch(function(error){
alert('catch' + JSON.stringify(error));
});
}
return {send : send};
})
The error is following:
{"data":null,"status":0,"config":{"method":"POST","transformRequest":[null],"transformResponse":[null],"url":"http://127.0.0.1:3000/s?table=register_rings","data":"{\"MyKey\":\"My Value\"}","headers":{"Content-Type":"application/json","Access-Control-Allow-Origin":"*","Accept":"application/json, text/plain, */*"},"responseType":"json"},"statusText":""}
I suspect that I should insert CORS headers, but I am not sure how to do that.
Any help would be appreciated

Answer 1

The problem is how you are transmitting the data over to server. This is because jQuery and Angular serialize the data differently.
By default, jQuery transmits data using Content-Type: x-www-form-urlencoded and the familiar foo=bar&baz=moe serialization. AngularJS, however, transmits data using Content-Type: application/json and { "foo": "bar", "baz": "moe" } JSON serialization, which unfortunately some Web server languages — notably PHP — do not unserialize natively.
To workaround this AngularJS developers provided hooks into the $http service to let us impose x-www-form-urlencoded.
$http({
method :'POST',
url:'...',
data: data, // pass in data as strings
headers :{'Content-Type':'application/x-www-form-urlencoded'} // set the headers so angular passing info as form data (not request payload)
});
Please read this post for a working solution:
http://victorblog.com/2012/12/20/make-angularjs-http-service-behave-like-jquery-ajax/