httpfetcher.Config gets an optional DialContext. When it is set, New
connects with it in place of the dialer that refuses internal addresses;
the URL check and the redirect check still run. Nothing in the config
file or the environment sets it, and pixa builds its fetcher without it,
so production connects exactly as before. It lets a test outside this
package send a public-looking address to a local test server. New tests
check that a fetcher built without it refuses to connect to a local
server, and that one built with it connects through it while a loopback
URL and a redirect to a link-local address are still refused.
Model: opus-5-5
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