With cdn.example.com allowlisted, CDN.Example.com and
cdn.example.com:8443 passed the allowlist too, and each spelling had its
own cache entries and its own connections under
upstream_connections_per_host. The image URL parser now lower-cases the
host and refuses one holding "@" with ErrInvalidHost (400).
ValidateRequest counts a host followed by ":", with or without a port,
as not allowlisted, so it needs a signature. That check is not in
allowlist.IsAllowed, which also matches referer_blocklist. A URL is now
signed over the lower-cased host; README.md says so.
Model: opus-5-5
sneak
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