title: How does spring manage session?
body: <p>I have a small springboot app which gets a file uploaded, do some work on it. and returns back another file. I have implemented frontend using reactJS. There is a static variable which holds the name of file. It works fine with one file. But, when I throw multiple files at it, the file which gets uploaded at last overrides the static variable for each operation. I'm new to spring and I have read each request is handled in a different container. I'm not able to understand how one 'container' is creating ruckus in another 'container'?</p>