Cowboy: how to stream (Partial Content 206) a video?

[fancycade]

Someone posted a stream handler implementation a few weeks ago:

A documented Cowboy Stream Handler reference implementation

Hi everyone! I had to write a cowboy stream handler for work this week, and in the process, I put together this little reference module with comments to use as a jumping off point for when I have to write these in the future. Someone pointed out that I should share it online, so here it is! Figured others might find a use for it.