@jugglinmike - I've put wpt.reviews as a placeholder here; where are mirrors currently being put?

Also, how do I test this code..?

Tests for the script are defined here. The script accepts the domain as input (since one might ostensiby want to run it against a GitHub Enterprise instance), and the tests use this to redirect requests to the loopback interface. In other words, you can script the client/server protocol.

Closing this stale PR.