NEXT_PUBLIC_API_URL was hardcoded to http://localhost:8083/api which
gets baked into webpack bundles at build time. NEXT_PUBLIC_* vars
run in the browser, so "localhost" resolves to the *user's own PC*,
not the office host running the container — connect refused for
anyone hitting the site over Tailscale or LAN.
Use a relative URL (/api) and let next dev's rewrites proxy to
SERVER_API_URL (invyone-backend-spring:8081 inside invyone-net).
This way the request always lands on whatever host the browser is
already talking to (localhost / 100.126.230.80 / public domain),
and the Next dev server forwards it to the backend container.
Verified: POST /api/auth/login from browser path returns the spring
controller's 400 response, confirming the full
browser → frontend → backend chain works.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
gbpark
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