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import { NextResponse } from 'next/server'
import { headers as nextHeaders, draftMode } from 'next/headers'
/**
* @param {import('next/server').NextRequest} request
*/
export async function middleware(request) {
const headersFromRequest = new Headers(request.headers)
// It should be able to import and use `headers` inside middleware
const headersFromNext = await nextHeaders()
headersFromRequest.set('x-from-middleware', 'hello-from-middleware')
// make sure headers() from `next/headers` is behaving properly
if (
headersFromRequest.get('x-from-client') &&
headersFromNext.get('x-from-client') !==
headersFromRequest.get('x-from-client')
) {
throw new Error('Expected headers from client to match')
}
if (request.nextUrl.searchParams.get('draft')) {
;(await draftMode()).enable()
}
const removeHeaders = request.nextUrl.searchParams.get('remove-headers')
if (removeHeaders) {
for (const key of removeHeaders.split(',')) {
headersFromRequest.delete(key)
}
}
const updateHeader = request.nextUrl.searchParams.get('update-headers')
if (updateHeader) {
for (const kv of updateHeader.split(',')) {
const [key, value] = kv.split('=')
headersFromRequest.set(key, value)
}
}
if (request.nextUrl.pathname.includes('/rewrite-to-app')) {
request.nextUrl.pathname = '/headers'
return NextResponse.rewrite(request.nextUrl)
}
if (request.nextUrl.pathname === '/rsc-cookies') {
const res = NextResponse.next()
res.cookies.set('rsc-cookie-value-1', `${Math.random()}`)
res.cookies.set('rsc-cookie-value-2', `${Math.random()}`)
return res
}
if (request.nextUrl.pathname === '/rsc-cookies/cookie-options') {
const res = NextResponse.next()
res.cookies.set('rsc-secure-cookie', `${Math.random()}`, {
secure: true,
httpOnly: true,
})
return res
}
if (request.nextUrl.pathname === '/rsc-cookies-delete') {
const res = NextResponse.next()
res.cookies.delete('rsc-cookie-value-1')
return res
}
if (request.nextUrl.pathname === '/preloads') {
const res = NextResponse.next({
headers: {
link: '<https://example.com/page>; rel="alternate"; hreflang="en"',
},
})
return res
}
return NextResponse.next({
request: {
headers: headersFromRequest,
},
})
}
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