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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteIn Nuxt 4.5, SSR streaming is experimental and off by default. After enabling it with experimental: { ssrStreaming: true }, you can opt a route or route pattern out with streaming: false in routeRules. Use this when a route must finish rendering before Nuxt sends its response, or when rendering-time code needs to set headers, cookies, or status reliably.
Disable streaming for a route or route pattern
Set streaming: false on the relevant route rule. The following example enables streaming globally, then uses a wildcard rule to keep the matching routes buffered:
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export default defineNuxtConfig({
experimental: { ssrStreaming: true },
routeRules: {
'/no-stream/**': { streaming: false },
},
})For a narrower path, replace /no-stream/** with the route you want to exclude. Nuxt documents this as the static, route-level opt-out. See the Nuxt 4.5 announcement and the Nuxt experimental-features guide.
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Choose between a route rule and a per-request decision
A route rule is the simplest choice when the URL alone determines whether the route should stream. If the decision depends on request state—for example, authentication, a cookie, or an A/B test bucket—Nuxt also documents a runtime control through the render:route hook.
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| Control | Scope | Decision input | Where to configure it |
|---|---|---|---|
streaming: false |
A route or route pattern | Configured URL pattern | routeRules |
ctx.prefersStream = false |
An individual request | Request-specific state or logic | render:route hook |
The hook runs before rendering each request. Check ctx.canStream and set ctx.prefersStream = false when the request should use buffered rendering. Nuxt’s guide also gives conditional 404 handling as an example. Consult the hook documentation for the current context and hook details.
Know when Nuxt already bypasses streaming
Setting a route rule is not the only reason a request may avoid streamed output. Nuxt’s guide lists these cases, which may use buffered rendering or short-circuit into a redirect or error instead:
- A route rule sets
noScripts,cache,isr,swr,redirect, orstreaming: false. - The route uses
ssr: false. - The request comes from a bot or crawler. Nuxt excludes these by default so they receive fully rendered HTML; the matching pattern can be customized with
experimental.ssrStreaming.botRegex. The documented default targets indexing crawlers and intentionally excludes Lighthouse and other audit tools. - The route has been prerendered.
- Server-side
navigateTo()redirects during a plugin, middleware, or page setup. - A fatal error occurs before the HTML shell is flushed.
For the meanings and configuration of route rules, see Nuxt’s rendering modes guide and configuration reference.
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Streaming sends the HTML shell—including the head, styles, preload hints, and entry scripts—before progressively sending the rendered body. The first flush commits the response status and headers. Changes attempted during component rendering after that point cannot be sent to the client; Nuxt describes this as inherent to streaming, rather than a Nuxt-specific bug.
That timing matters for rendering-time calls such as setResponseStatus(), useResponseHeader(), cookie writes through useCookie(), and h3 header operations. If the change must reach the client, move it into a Nuxt or Nitro plugin that runs before rendering, where possible, or disable streaming for the route. In development, Nuxt logs a warning identifying dropped mutations and the route.
Module authors: distinguish pre-flush and body hooks
The render:html hook runs before the shell flush. Changes to htmlAttrs, head, bodyAttrs, and bodyPrepend can reach the response. Changes to body or bodyAppend are dropped because the body is about to stream.
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Check CSS and other rendering caveats
Nuxt’s guide says route styles arrive after the shell. Styles for the page, layout, and directly nested async components can be available before body paint; styles from an async component nested inside another async component may arrive with the closing HTML, after that component’s DOM.
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In production builds, Nuxt extracts styles to CSS files or inlines them. Island slot content and selective-client components use inert templates and an inline relocation script; apps using features.noScripts with island components fall back to buffered rendering.
Validate the production response before rollout
Development behavior is not a substitute for checking a production build, particularly for CSS timing. Nuxt recommends running nuxt build && nuxt preview and validating the visuals. Also check the response behavior on routes where headers, status codes, or cookies depend on rendering-time logic, and confirm that your selected static or request-specific opt-out produces the intended buffered response.
The Nuxt 4.5 announcement describes potential TTFB improvement qualitatively, but the cited official sources publish no numerical benchmark or performance statistic. Treat performance as something to measure in your own application rather than assuming a particular gain.
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