I built this little JavaScript demo app to practice http requests. Indeed, I used two alternatives: XMLHttpRequest and the fetch() API. I was able to add data, promisify XMLHttpRequest and handle errors. I also used two data structures: JSON and FormData. The goal of this demo was to send data http requests from client side JavaScript to a server.
https://sofiane-abou-abderrahim.github.io/javascript-http-requests/
