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Marc-André Bombeck
94bed12edc
A Nightscout self-host on host networking with NIGHTSCOUT_PRIVATE_ORIGINS=http://localhost:1337 worked before and must keep working unchanged; an operator who lists an exact loopback origin with its port has made the same deliberate decision as one who lists a LAN origin. The never-grantable floor is now the unspecified address, link-local and the metadata endpoint only. Loopback (127/8, ::1, localhost) is grantable when listed exactly, still resolved and pinned at connect time with redirects forbidden, and still refused when not listed. ::1 is answered before the embedded-IPv4 unwrap, which read it as the IPv4-compatible spelling of 0.0.0.1 and refused it as unspecified. The pinned Nightscout transport test runs the real floor again. Each refused range keeps its own test; loopback moves to the grantable-when-listed set with a test that an unlisted loopback is still refused, and a Nightscout grant of http://localhost:1337 is asserted to parse. Refs #947