jQuery and Cross Domain POST Requests

Question

I'm developing a jQuery plug-in that will be a connector for some REST API. The implementation is straight forward, but the same origin policy is definitely painfull. I need to perform mostly POST requests.

I also tried to implement the OPTIONS method and returning (is python, but the meaning should be clear)

def options(self):
  self.response.headers['Access-Control-Allow-Origin'] = self.request.host_url
  self.response.headers['Access-Control-Allow-Methods'] = 'POST, GET, OPTIONS'
  self.response.headers['Access-Control-Allow-Headers'] = 'x-requested-with'
  self.response.headers['Access-Control-Max-Age'] = '1728000'

still doesn't work... any idea ?

PS: I have seen that there are other question with a similar topic but i need a specific solution for POST method (GET could be easely implemented by using iframes)

Javascript example:

$.ajax({
    url: options.protocol+'://'+options.host+':'+options.port+'/'+method,
    data: rawData,
    async:false,
    dataType: "json",
    type:"POST",
    success:function(data)
    {
        alert('asd');
        result.data = data;
        alert(data);
    },
    error:function(lol){
        alert('omggg !!!!'+lol);
    }

});

EDIT: added javascript code example