I'm trying to make a POST request to API v3.0, but I can not. Returns this error.
https://api.finder.healthcare.gov/v3.0/getCountiesForZip. Invalid HTTP status code 503
It's about CORS, but e tried all possible ways to request, following and enabling CORS, but nothing works

We're working to resolve the issue as soon as possible. Please try again later.
– Andrew - OpenGeoCode Dec 16 '14 at 16:32