Why doesn't Dart DevTools' Network page show a Response?

Question

I'm making a simple call to http://postman-echo.com/get?foo=bar but the Response tab of Dart Devtools' Network page doesn't show anything. Is this a bug or is there something that I need to do to make it show the results by default?

Here is the code I'm running to make the request:

var headers = {'Content-Type': 'application/json'};
var request = http.Request('GET', Uri.parse('http://postman-echo.com/get?foo=bar'));

request.headers.addAll(headers);

http.StreamedResponse response = await request.send();

if (response.statusCode == 200) {
    dynamic jsonData = jsonDecode(await response.stream.bytesToString());
}