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Web Frontend2026-05-17

Streaming

Also known as: Streaming SSR / HTML Streaming / ストリーミング

A rendering technique where the server sends HTML chunks to the browser progressively as they become ready, rather than waiting to generate the full page. Combined with Suspense, it improves TTFB and perceived performance.


Overview

Streaming SSR uses HTTP Transfer-Encoding: chunked to send the first HTML bytes before data fetching completes. Next.js App Router sends chunks per Suspense boundary, rendering skeleton → header → content in sequence, improving LCP and FCP.

Edge Streaming

Vercel Edge Functions and Cloudflare Workers can return streaming responses from edge nodes, enabling fast streaming delivery from geographically close edges.

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