var getApiIpfsCurrent = function(onSuccess, onError) {
  var xhr = new XMLHttpRequest();
  xhr.open('GET', '/api/ipfs/current', true);
  xhr.setRequestHeader('Accept', 'application/json');
  xhr.onreadystatechange = function () {
    var res = null;
    if (xhr.readyState === 4) {
      if (xhr.status === 204 || xhr.status === 205) {
        onSuccess();
      } else if (xhr.status >= 200 && xhr.status < 300) {
        try { res = JSON.parse(xhr.responseText); } catch (e) { onError(e); }
        if (res) onSuccess(res);
      } else {
        try { res = JSON.parse(xhr.responseText); } catch (e) { onError(e); }
        if (res) onError(res);
      }
    }
  };
  xhr.send(null);
};