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revalidate-headers.ts
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/
revalidate-headers.ts
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import type { ServerResponse } from 'http'
import type { BaseNextResponse } from '../base-http'
import type { PayloadOptions } from './index'
export function setRevalidateHeaders(
res: ServerResponse | BaseNextResponse,
options: PayloadOptions
) {
if (options.private || options.stateful) {
if (options.private || !res.hasHeader('Cache-Control')) {
res.setHeader(
'Cache-Control',
`private, no-cache, no-store, max-age=0, must-revalidate`
)
}
} else if (typeof options.revalidate === 'number') {
if (options.revalidate < 1) {
throw new Error(
`invariant: invalid Cache-Control duration provided: ${options.revalidate} < 1`
)
}
res.setHeader(
'Cache-Control',
`s-maxage=${options.revalidate}, stale-while-revalidate`
)
} else if (options.revalidate === false) {
res.setHeader('Cache-Control', `s-maxage=31536000, stale-while-revalidate`)
}
}