Previously, request groups didn't support permalinks for requests within the group. It would simply select the first request and display that.
You'd have link that looked like this:
Which would contain some requests: RequestGroup1-foo1, RequestGroup1-foo2, RequestGroup1-foo3
Now you can link them directly:
The default behavior is maintained, no request ID means display the first request. Incorrect request ID will still load the selected group page, but the request data will not be displayed since there is none.