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_middleware.js
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_middleware.js
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import { NextResponse } from 'next/server'
/**
* @param {import('next/server').NextRequest} request
*/
export async function middleware(request) {
const url = request.nextUrl
if (
url.pathname.startsWith('/rewrites/about') &&
url.searchParams.has('override')
) {
const isExternal = url.searchParams.get('override') === 'external'
return NextResponse.rewrite(
isExternal
? 'https://example.vercel.sh'
: new URL('/rewrites/a', request.url)
)
}
if (url.pathname.startsWith('/rewrites/to-blog')) {
const slug = url.pathname.split('/').pop()
url.pathname = `/rewrites/fallback-true-blog/${slug}`
return NextResponse.rewrite(url)
}
if (url.pathname === '/rewrites/rewrite-to-ab-test') {
let bucket = request.cookies.get('bucket')
if (!bucket) {
bucket = Math.random() >= 0.5 ? 'a' : 'b'
url.pathname = `/rewrites/${bucket}`
const response = NextResponse.rewrite(url)
response.cookies.set('bucket', bucket, { maxAge: 10 })
return response
}
url.pathname = `/rewrites/${bucket}`
return NextResponse.rewrite(url)
}
if (url.pathname === '/rewrites/rewrite-me-to-about') {
url.pathname = '/rewrites/about'
return NextResponse.rewrite(url)
}
if (url.pathname === '/rewrites/rewrite-me-with-a-colon') {
url.pathname = '/rewrites/with:colon'
return NextResponse.rewrite(url)
}
if (url.pathname === '/rewrites/colon:here') {
url.pathname = '/rewrites/no-colon-here'
return NextResponse.rewrite(url)
}
if (url.pathname === '/rewrites/rewrite-me-to-vercel') {
return NextResponse.rewrite('https://example.vercel.sh')
}
if (url.pathname === '/rewrites/clear-query-params') {
const allowedKeys = ['allowed']
for (const key of [...url.searchParams.keys()]) {
if (!allowedKeys.includes(key)) {
url.searchParams.delete(key)
}
}
return NextResponse.rewrite(url)
}
if (
url.pathname === '/rewrites/rewrite-me-without-hard-navigation' ||
url.searchParams.get('path') === 'rewrite-me-without-hard-navigation'
) {
url.searchParams.set('middleware', 'foo')
url.pathname = request.cookies.has('about-bypass')
? '/rewrites/about-bypass'
: '/rewrites/about'
const response = NextResponse.rewrite(url)
response.headers.set('x-middleware-cache', 'no-cache')
return response
}
}