Proxy providers sell two fundamentally different behaviors through one product. Rotating sessions hand you a different exit for every request. Sticky sessions promise the same exit for a window of time — minutes, sometimes longer — so that multi-step flows see a consistent identity.
When rotation is right
Stateless collection at scale — product pages, listings, search results — usually wants rotation. Each request is independent, and spreading requests across exits is exactly the point. Rotation hides volume; what it cannot do is carry state.
When sticky is non-negotiable
Anything with a login, a cart, or a multi-page wizard needs the target to see one consistent client. If your session hops exits mid-flow, you inherit every symptom of a hijacked session: forced re-authentication, invalidated carts, security challenges. For these workloads the interesting question is not whether a provider offers sticky sessions — nearly all claim to — but whether the exit actually holds.
What to verify before you scale
- Measure hold rate yourself: run follow-up requests inside one session and check the observed exit stays constant. This is exactly what our session dimension grades.
- Learn the re-rotation rules: what happens when an exit dies mid-session — silent replacement, error, or hang?
- Check the session window against your flow length: a 10-minute sticky window is useless for a 25-minute process.
- Price it: some providers meter sticky sessions differently than rotating traffic.
The two modes fail differently, and a provider can be excellent at one and mediocre at the other. That is why session behavior is its own graded dimension here rather than a bullet on a feature list.