如何使用 Next.js 與 Vercel 進行 A/B 測試
Original: How to run A/B tests with Next.js and Vercel
This official guide from Vercel details how to run A/B tests efficiently in a Next.js project. Traditional A/B testing typically relies on…
本文介紹在 Next.js 與 Vercel 環境下實作 A/B 測試的最佳實踐。傳統用戶端 A/B 測試常導致頁面閃爍並影響 Core Web Vitals 效能指標，而 Vercel 透過 Edge Middleware（邊緣中間件）在邊緣端進行請求攔截與重寫，實現零延遲且不影響載入速度的高效能分流體驗。
This official guide from Vercel details how to run A/B tests efficiently in a Next.js project. Traditional A/B testing typically relies on client-side JavaScript (tools such as Google Optimize), which causes severe "Flash of Original Content" (FOOC) — a jarring flicker the user sees before the variant loads — and negatively impacts Google's Core Web Vitals (such as the CLS cumulative layout shift score). Switching to traditional server-side rendering (SSR) for traffic splitting, on the other hand, sacrifices the speed advantage of statically generated pages.
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