frontend/node_modules/next/dist/esm/server/lib/cache-control.js

import { CACHE_ONE_YEAR } from '../../lib/constants';
export function getCacheControlHeader({ revalidate, expire }) {
    const swrHeader = typeof revalidate === 'number' && expire !== undefined && revalidate < expire ? `, stale-while-revalidate=${expire - revalidate}` : '';
    if (revalidate === 0) {
        return 'private, no-cache, no-store, max-age=0, must-revalidate';
    } else if (typeof revalidate === 'number') {
        return `s-maxage=${revalidate}${swrHeader}`;
    }
    return `s-maxage=${CACHE_ONE_YEAR}${swrHeader}`;
}

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