Server Code HTTp POST to remote server; Javascript API call

Server Code HTTp POST to remote server; Javascript API call

I found an answer to a question that tells what to do, but I don't know
how to implement it.
jQuery cross domain POST shenanigans
I'm programming in Django and javascript
Steps:
1. ajax post to a local URL - Where do I find this URL?
2. Server code will do an HTTP POST to remote server - How do I do this in
django?
3. Send response to JS - I can figure that out.
Thanks