get the latest capture info from the server
function () {
			var self = this;
			console.log('updating...');
			var req = get_req();
			req.onreadystatechange = function update_state_response () {
				if (req.readyState === 4) {
					if (req.status === 200) {
						var capture = JSON.parse(req.responseText);
						if (capture.error) {
							alert(capture.error.message);
						}
						htracr.ui.update(capture);
						console.log('updated.');
					} else {
					  console.log('no updates.');
					}
				}
			};
			req.open("GET", "/conns", true);
			req.send("");
			return false;
		}