Best Practices for Chunked Upload in Node.js

A couple other issues I can spot:

1. Your code doesn't appear to ever call /upload_session/finish. You'll need to detect when you've uploaded the entire file and use that endpoint to close out the upload session.
2. A while loop can't work here. You need to wait for each call to /upload_session/append_v2 to complete before calling again. Your code kicks off a bunch of concurrent HTTP requests, so I'd expect you to see error responses from the server on at least some of them.
3. You should be updating the value of `offset` when /upload_session/append_v2 returns. (This is part of what you'll do as you turn the while loop into a recursive call instead.) Otherwise, all your calls to /upload_session/append_v2 will try to use the same offset, and all but one call (the first one to make it through) will fail.
4. You may also need to put a size limit on your calls to `read`. I believe your current code has the potential of reading too much data and exceeding the maximum size allowed by /upload_session/start and /upload_session/append_v2.