Extract the WWDC 2017 Sample Code URL from the sessions page. Just paste it into the JS console on https://developer.apple.com/wwdc/schedule/

extract_wwdc_samplecode.js

$.getJSON( "https://devimages-cdn.apple.com/wwdc-services/h8a19f8f/049CCC2F-0D8A-4F7D-BAB9-2D8F5BAA7030/contents.json", function( data ) {
  var items = [];

  $.each( data.contents, function( key, val ) {
    if (val.type == 'Session' && val.eventId == 'wwdc2017' && val.related && val.related.resources) {
      $.each(val.related.resources, function (resKey, resId) {
        var resource = data.resources[resId]

        if (resource && resource['resource_type'] == 'samplecode') {
          items.push(resource);
        }
      });
    }
  });

  console.log(items);
});