https://media.pearsoncmg.com/aw/ecs_kurose_compnetwork_7/cw/content/interactiveanimations/http-delay-estimation/index.html

In piplining, the object requests are “back to back”

The proxy server can have a web cache copy so it doesn’t have to request the origin again.

Cache

1. hit, the request was cached
2. miss, the request was not cached