development_data_inject.js

// http://app.toronto.ca/DevelopmentApplications/dwr/test/MapSearchService

var reply0 = function(data)
    {
      if (data != null && typeof data == 'object') console.log(dwr.util.toDescriptiveString(data, 100));
      else dwr.util.setValue('d0', dwr.util.toDescriptiveString(data, 1));
    }

function keep_alive() {
    http_request = new XMLHttpRequest();
    http_request.open('GET', "/restricted_file_url");
    http_request.send(null);
};

setInterval(keep_alive,840000);  //My session expires at 15 minutes

Great code and clear and simple and console. Look forward to contributing to your code. This is great for the Open Data Community.