Ajax Complete Example: Full Headers

$.ajax({
    url: 'https://api.wmata.com/Rail.svc/json/jStations?' + $.param(params), //LineCode=BL
    beforeSend: function(xhrObj) {
      //Request headers
      xhrObj.setRequestHeader('api_key', key);
    },
    type: 'GET',
    // Request body
    data: '{body}'
  })
    .done(function(data) {
      console.log(data);
      var stationList = new Array();
      console.log('Length: ' + data.Stations.length);
      for (var x = 0; x < data.Stations.length; x++) {
        console.log(x);
        var name = data.Stations[x].Name;
        var id = data.Stations[x].Code;
        var thisStation = new Station(name, id);
        stationList.push(thisStation);
      }
      for (var x = 0; x < stationList.length; x++) {
        var out = "<option value='" + stationList[x].stationId + "'>";
        out += stationList[x].stationName;
        out += '</option>';
        document.getElementById('stationListSelector').innerHTML += out;
      }
    })
    .fail(function() {
      alert('error');
    });