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With `cdn.example.com` allowlisted, other letter cases and a host with a port also passed the allowlist; each spelling was fetched and cached on its own with its own per-host connection limit, and a port let an unsigned URL reach any port of the host. The image URL parser now lower-cases the host and refuses one holding `@` with 400. A host followed by `:`, with or without a port (read as Go's URL parser reads it, unbracketed IPv6 included), never counts as allowlisted, so it needs a signature. The host is signed lower-cased, as the URL writes it, so a signature made over an upper-case spelling is refused with 401. Model: opus-5-5