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886e748aa7
Follow-up to the multi-reviewer review of the SSRF fix: - Restore charset handling lost when switching from extract() to response.text(): non-UTF-8 pages (Shift_JIS/GBK/EUC/Big5, common on CJK sites this project targets) decoded as mojibake. Now read the body as bytes, detect charset from Content-Type / <meta charset>, and decode with TextDecoder before extractFromHtml. - Wrap extractFromHtml in try/catch: it throws (not returns null) on empty/non-HTML bodies, which previously surfaced as a 500 instead of the intended 400. - Add 100.64.0.0/10 (RFC 6598 CGNAT) to isPrivateIp; it is routable inside some cloud internal networks and was a residual SSRF target. - Add tests for CGNAT, its boundaries, 0.0.0.0, and DNS-resolved IPv6.