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Tommaso CasaburiandGitHub
a92b185a66
* chore(ai-workflow): track repo-managed review tooling * fix(ai-workflow): remove repo-specific path assumptions Make shared workflow hooks and APK testing guidance resolve paths from the repo and contributor environment so the tooling works for all contributors, not just one machine.
74 lines
2.0 KiB
Markdown
74 lines
2.0 KiB
Markdown
---
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title: Use after() for Non-Blocking Operations
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impact: MEDIUM
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impactDescription: faster response times
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tags: server, async, logging, analytics, side-effects
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---
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## Use after() for Non-Blocking Operations
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Use Next.js's `after()` to schedule work that should execute after a response is sent. This prevents logging, analytics, and other side effects from blocking the response.
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**Incorrect (blocks response):**
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```tsx
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import { logUserAction } from '@/app/utils'
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export async function POST(request: Request) {
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// Perform mutation
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await updateDatabase(request)
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// Logging blocks the response
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const userAgent = request.headers.get('user-agent') || 'unknown'
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await logUserAction({ userAgent })
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return new Response(JSON.stringify({ status: 'success' }), {
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status: 200,
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headers: { 'Content-Type': 'application/json' }
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})
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}
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```
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**Correct (non-blocking):**
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```tsx
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import { after } from 'next/server'
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import { headers, cookies } from 'next/headers'
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import { logUserAction } from '@/app/utils'
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export async function POST(request: Request) {
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// Perform mutation
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await updateDatabase(request)
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// Log after response is sent
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after(async () => {
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const userAgent = (await headers()).get('user-agent') || 'unknown'
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const sessionCookie = (await cookies()).get('session-id')?.value || 'anonymous'
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logUserAction({ sessionCookie, userAgent })
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})
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return new Response(JSON.stringify({ status: 'success' }), {
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status: 200,
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headers: { 'Content-Type': 'application/json' }
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})
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}
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```
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The response is sent immediately while logging happens in the background.
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**Common use cases:**
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- Analytics tracking
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- Audit logging
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- Sending notifications
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- Cache invalidation
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- Cleanup tasks
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**Important notes:**
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- `after()` runs even if the response fails or redirects
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- Works in Server Actions, Route Handlers, and Server Components
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Reference: [https://nextjs.org/docs/app/api-reference/functions/after](https://nextjs.org/docs/app/api-reference/functions/after)
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