Force AngularJS $http.post to return JSON

Coming from jQuery, setting the content-type to application/json would give me a json object instead of an xml-formatted string.

How can I achieve the same using AngularJS $http.post?

Tried doing

$http({
    method: "post",
    url: "url",
    headers: { "Content-Type": "application/json; charset=utf-8" }
})

but the parameter in success is an xml-formatted string.