What is the X-REQUEST-ID http header?

Question

I have already googled a lot this subject, read various articles about this header, its use in Heroku, and projects based on Django.

However, it\'s still all confuse

Answer 1

This request header can be used for syncrhonization. Let's say you've built a ToDo list that offers offline capability. Your user creates 3 items and each of them are given a unique UUID on the offline application. When network connectivity is available, the records are POSTed to the server and the corresponding IDs auto-generated from the database are returned. You can then replace the IDs in your app (e.g. "id" attribute of HTML "li" element).