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errors/proxy-user-agent.mdx
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Jiwon Choi
docs: Replace Middleware docs to Proxy (#84709)
17 окт 2025, 17:13
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17 окт 2025, 17:13
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--- title: Removed req.ua from Proxy API --- ## Why This Error Occurred Your proxy is interacting with `req.ua` and this feature needs to opt-in. ```ts filename="proxy.ts" import { NextRequest, NextResponse } from 'next/server' export function proxy(request: NextRequest) { const url = request.nextUrl const viewport = request.ua.device.type === 'mobile' ? 'mobile' : 'desktop' url.searchParams.set('viewport', viewport) return NextResponse.rewrite(url) } ``` ## Possible Ways to Fix It To parse the user agent, import `userAgent` function from `next/server` and give it your request: ```ts filename="proxy.ts" import { NextRequest, NextResponse, userAgent } from 'next/server' export function proxy(request: NextRequest) { const url = request.nextUrl const { device } = userAgent(request) const viewport = device.type === 'mobile' ? 'mobile' : 'desktop' url.searchParams.set('viewport', viewport) return NextResponse.rewrite(url) } ```