Function getUsableLastModified

lib/interceptor/cache.js:146–151

(headers)

}

function getUsableLastModified (headers) {
  const lastModified = headers?.['last-modified']
  if (typeof lastModified === 'string' && parseHttpDate(lastModified)) {
    return lastModified
  }
}

function makeRevalidationHeaders (opts, result) {
  const headers = {