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import { createNext, FileRef } from 'e2e-utils'
import { NextInstance } from 'e2e-utils'
import { join } from 'path'
import { fetchViaHTTP, waitFor } from 'next-test-utils'
describe('app-dir-prevent-304-caching', () => {
let next: NextInstance
beforeAll(async () => {
next = await createNext({
files: {
'next.config.js': new FileRef(join(__dirname, 'next.config.js')),
app: new FileRef(join(__dirname, 'app')),
},
})
})
afterAll(() => next.destroy())
// https://github.com/vercel/next.js/issues/56580
it('should not cache 304 status', async () => {
// Fresh call
const rFresh = await fetchViaHTTP(next.url, '/')
expect(rFresh.status).toBe(200)
await waitFor(500)
// Cache HIT but still 200
const rHit = await fetchViaHTTP(
next.url,
'/',
{},
{
headers: {
'If-None-Match': rFresh.headers.get('etag'),
},
}
)
expect(rHit.status).toBe(200)
await waitFor(500)
// Here happens the race condition
const r304 = await fetchViaHTTP(
next.url,
'/',
{},
{
headers: {
'If-None-Match': rHit.headers.get('etag'),
},
}
)
expect(r304.status).toBe(304)
// ... Postponed but should not save 304 ...
await waitFor(1000)
// Now without cache headers should 200
const rStillFresh = await fetchViaHTTP(next.url, '/')
expect(rStillFresh.status).toBe(200)
})
})
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