How does a Gmail message Id or ThreadId map to the new Gmail UI?

Question

Edit: addressing the first comment below and for clarity, this isn\'t a code question. The question is simply:

What do I put into t

Answer 1

Building on @kremonte gist, and @chris-wood comments, I made a rails gem that correctly creates the open-the-draft-inside-gmail URL.

It's here - https://github.com/GoodMeasuresLLC/gmail_compose_encoder

It's for the use case of "my code created a draft (prepopulated with some text, of course) and now I want to open the draft in compose mode so that my user can review it before hitting "send".