Automatic website compatibility is the core competency of professional scraping APIs. It involves maintaining a multi-layered set of techniques that evolve continuously as protection vendors update their detection models. The compatibility stack typically operates at four levels: network (TLS fingerprint matching, IP reputation management, residential proxy routing), HTTP (realistic header sets, correct header order, content negotiation), browser (browser environment management, realistic behaviour simulation), and application (challenge solving, challenge resolution, cookie management).
No single compatibility technique is sufficient in isolation. A request with a perfect TLS fingerprint but an inconsistent User-Agent will still be flagged. A request with perfect headers but originating from a known datacenter IP will be challenged. Effective website compatibility requires all layers to be consistent and up-to-date with the protection vendor's current model.
AlterLab's tiered engine architecture routes requests through the appropriate compatibility stack based on the target site's protection level: Tier 1 (basic headers) through Tier 4 (full browser with browser environment management and behavioural simulation), automatically selecting the minimum viable tier to reduce latency while maintaining a high success rate.