“Zero-Downtime Incremental Migration Architecture Never attempt a "big bang" rewrite where you replace an entire 10-year-old PHP codebase in one overnight release. Search engine rankings will plummet if URLs break. 4-Step Reverse Proxy Migration: 1. Preserve URL Permalinks: Maintain an exact slug-to-slug redirect map in next.config.ts. 2. Reverse...”
Comprehensive Solution & Technical Breakdown
### Zero-Downtime Incremental Migration Architecture
Never attempt a "big bang" rewrite where you replace an entire 10-year-old PHP codebase in one overnight release. Search engine rankings will plummet if URLs break.
#### 4-Step Reverse Proxy Migration: 1. **Preserve URL Permalinks:** Maintain an exact slug-to-slug redirect map in `next.config.ts`. 2. **Reverse Proxy Fallback:** Configure Next.js rewrites: ```typescript // next.config.ts async rewrites() { return { fallback: [ { source: '/:path*', destination: 'https://legacy-php.mysite.com/:path*' } ] }; } ``` Next.js serves ported pages first. Any un-migrated URL seamlessly falls back to the legacy server without user disruption. 3. **Headless Data Ingestion:** Extract WordPress or MySQL content via REST API or direct SQL scripts into a modern PostgreSQL or Supabase database.
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