Using `?pp=async-flamegraph` causes the flamegraph data to be stored in the page_struct, and made available via a link in the mini_profiler UI. Flamegraph data will also be recorded and stored for all AJAX requests with `?pp=async-flamegraph` in the `Referer` header. This is useful in a few situations:

- You want to view flamegraphs for AJAX requests made by a Javascript application. By supplying `pp=async-flamegraph`, flamegraph links for every AJAX request will be made available in the mini-profiler UI.

- You want to see the HTML result of a request, and view the flamegraph later. The existing `?pp=flamegraph` option hides the true output.

- You are performing the request via a tool like `curl`, and would like to view the flamegraph later in the browser (you can extract the X-MiniProfiler-Ids header from the response, then view flamegraph in the browser)

All we need for the `results` route is a boolean. The `/flamegraph` route takes care of the actual flamegraph data