What is the term for data leaking from one HTTP request to another and how to prevent it?

Context
We recently added a feature that used a library whose API we misunderstood. Long story short, if user A sends a request to our web application, the library caches some result, and that result may show in a response to user B’s requ… Continue reading What is the term for data leaking from one HTTP request to another and how to prevent it?