where is the real time copy of the index.html that ember-cli serves?

How do I get to the latest index.html file that will be served by ember-cli from its tmp folders?

I am doing some post processing on the final copies of the generated index.html and I am unable to find docs or references to how I can pick this path up on node side of things right before I serve the html when a GET request is being honored.

Basically, I have a use case to manipulate the index.html, add some tags(in real time). Right now I use dist/index.html, but that seems to just be a temporary copy.