request headers host unexpectedly changed

[mjkohan]

i have a multi-tenancy app.
the req headers suddenly working unexpected
const hostname = req.headers.get("host")
the host name is [::1]:51709. it was like :"shop1.exmple.com"
im using req.headers.get("referer") for the hotfix but its null sometimes and im looking for a right solution

[brendanmoore]

This issue was introduced in #53131 in this release: https://github.com/vercel/next.js/releases/tag/v13.4.15 downgrading to 13.4.14 or below fixes the issue. It looks like NextJS exposes the hostname in other ways internally that would be really helpful, but its not accessible in pages router (so it seems)