That's yet another moving part with its own error modes. And I'm not quite sure (without having it thought through) how I would do something like get the URL o

That's yet another moving part with its own error modes. And I'm not quite sure (without having it thought through) how I would do something like get the URL of the last permanent redirect and correlate it with the original request. I'm sure it's possible somehow, but it doesn't seem exactly straightforward.