Why does a cross-domain angularjs $http.post request fail when a XMLHttpRequest succeeds?

Question

I am trying to exercise the Trello API with an application key and token from an angular (version 1.0.5) webapp. The server seems correctly configured to handle CORS. A test req

Answer 1

This worked for me

$http({
      method  : "POST",
      url     : url,
      data    : $.param({key: 'value', key2 : 'value'}),
      headers : { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' }
                })