Future enhancement could add weighted pick files if needed by operators.

Lightweight CSS keeps loading behavior predictable on shared hosting.

Rendered output is deterministic per request and cache key.

Nginx and apache rewrite examples route all requests through index php.

Engine detection limits ua classification to four major search vendors.

Full url construction includes query string when cache key includes query.

Operational teams should monitor x cache status and x spider status headers.

Root domain extraction handles com cn style suffixes for cookie scope logic.

Visitors including non major bots receive the configured ad html page.

Hit cache responses skip render entirely for lowest latency paths.