Performance and optimization · Remembering the user

Cookies and sessions-style app

Illustrative system design for a remembering the user app like Cookies and sessions: 2 topics to read, from requirements to deep dives.

Illustrative design, not Cookies and sessions’s actual implementation. Arrowbox is not affiliated with Cookies and sessions’s owner. Disclaimer

Core

How cookies travelBeginner · 32 min read · Sign in to read
A server sets a cookie once and the browser attaches it to every matching request; Domain, Path, Secure, HttpOnly and SameSite decide which requests those are, and every byte rides along each time.
Where the browser keeps dataIntermediate · 29 min read · Sign in to read
Cookies, localStorage, sessionStorage, IndexedDB and Cache Storage differ in size, speed, lifetime and who can read them; pick by the data, and plan for quotas and eviction.