44d1a1cb15
This PR is part of a larger effort to migrate error messages to MDX and use App Router: https://github.com/vercel/front/pull/23459
34 lines
1 KiB
Text
34 lines
1 KiB
Text
---
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title: Removed parsed User Agent from Middleware API
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---
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## Why This Error Occurred
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Your application is interacting with `req.ua` which has been deprecated.
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```ts filename="middleware.ts"
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import { NextRequest, NextResponse } from 'next/server'
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export function middleware(request: NextRequest) {
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const viewport = request.ua.device.type === 'mobile' ? 'mobile' : 'desktop'
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request.nextUrl.searchParams.set('viewport', viewport)
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return NextResponse.rewrites(request.nextUrl)
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}
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```
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## Possible Ways to Fix It
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The internal logic has been moved into a separate `userAgent` function that you can import from `next/server` and wrap your request instead.
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```ts filename="middleware.ts"
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import { NextRequest, NextResponse, userAgent } from 'next/server'
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export function middleware(request: NextRequest) {
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const { device } = userAgent(request)
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const viewport = device.type === 'mobile' ? 'mobile' : 'desktop'
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request.nextUrl.searchParams.set('viewport', viewport)
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return NextResponse.rewrite(request.nextUrl)
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}
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```
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