URL Normalizer (RFC 3986 + SEO)
Apply RFC 3986 §6 syntactic normalization (lowercase scheme/host, drop default port, decode unreserved %-escapes, resolve dot-segments) plus SEO extras: drop fragment, sort query, drop /index.html, HTTPS upgrade.
Sobre RFC 3986 §6
A RFC 3986 §6 (Normalization) define equivalência sintática: scheme/host em minúsculas, porta padrão removida, percent-escapes do conjunto unreserved decodificados (ALPHA / DIGIT / "-" / "." / "_" / "~"), demais percent-escapes em maiúscula, dot-segments resolvidos. Os toggles extras são heurísticas comuns de SEO para canonicalização.
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