hijax.js

var hijax = function (method, uri, callback) {
  var client = new XMLHttpRequest();
  
  client.open(method, uri, true);
  
  client.onload = function () {
    if (client.status >= 200 && request.status < 400) {
      callback(client.responseText);
    }
  };
    
  client.onerror = function () {
    throw client.responseText;
  };
  
  client.send();
};
  
hijax('POST', '/social-auth/facebook', function (r) {
  console.log(r);
});