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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | 8x 8x 8x 9x 9x 9x 18x 18x 39x 18x 6x 12x 12x 12x 18x | const CACHE_MAX_AGE = 3600
const SHARED_CACHE_MAX_AGE = 60
export function updateCacheControlHeader(headerValue: string): string {
headerValue = updateCacheControlAge(headerValue, 'max-age', CACHE_MAX_AGE)
headerValue = updateCacheControlAge(headerValue, 's-maxage', SHARED_CACHE_MAX_AGE)
return headerValue
}
function updateCacheControlAge(headerValue: string, type: 'max-age' | 's-maxage', cacheMaxAge: number): string {
const cacheControlDirectives = headerValue.split(', ')
const maxAgeIndex = cacheControlDirectives.findIndex(
(directive) => directive.split('=')[0].trim().toLowerCase() === type
)
if (maxAgeIndex === -1) {
cacheControlDirectives.push(`${type}=${cacheMaxAge}`)
} else {
const oldMaxAge = Number(cacheControlDirectives[maxAgeIndex].split('=')[1])
const newMaxAge = Math.min(cacheMaxAge, oldMaxAge)
cacheControlDirectives[maxAgeIndex] = `${type}=${newMaxAge}`
}
return cacheControlDirectives.join(', ')
}
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