fix(seo): vercel.json trailingSlash for edge redirects#239
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The Next.js trailingSlash config only affects build output (generating en/index.html vs en.html). Vercel static hosting still serves both /en and /en/ as 200 without redirecting. Adding trailingSlash: true to vercel.json makes Vercel enforce 308 /en → /en/ at the edge, so Semrush sees a single canonical URL form. Also updates root redirect / → /en/ to avoid double redirect.
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Merge gate (auto-classified): gate=smoke-passed — auto-classified by the gate-log enforcer (12min after merge, no Posted by |
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Summary
Adds
trailingSlash: trueto vercel.json so Vercel enforces 308 redirects at the edge (/en→/en/). Without this, both URL forms return 200 and Semrush flags hreflang conflicts on both variants.Also updates the root redirect
/→/en/to avoid a double redirect chain.Context
PR #236 added
trailingSlash: trueto next.config.mjs (build output) but Vercel static hosting needs the setting in vercel.json to enforce edge redirects.