Node can't reach its own public HTTPS URL (ECONNREFUSED 127.0.0.1:443)
because port 443 only exists on the nginx jail. Rewrite self-referential
fetch URLs to http://localhost:3000 in endpoint-posts, endpoint-syndicate,
and endpoint-share.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
