Workers fetch cache (tiered caching) - How to handle conditional caching?

export async function getReverseProxyResponseCacheApi(request: Request, requestRules: RequestRules, pageProviderUrl: string): Promise<Response> {
    // Disable caching when requesting on an internal IP
    const useCache = !SecurityService.isBusinessIpRequest(request);

    const cache = caches.default;

    // Appends various information to the URL to ensure that the cache key is unique. We include internal data
    // such as experiments, device, region, currency info, etc.
    const cacheKey = CacheKeyService.getCacheKey(request, pageProviderUrl);

    let page = useCache ? await cache.match(cacheKey) : undefined;

    if (!page) {
        const pageProviderResponse = await fetch(pageProviderUrl);
        page = new Response(pageProviderResponse.body, pageProviderResponse);

        if (useCache && page.ok) {
            const cacheControl = pageProviderResponse.headers.get('cache-control');
            // If the cache is not public, or set to no-store, don't cache
            if (cacheControl && !cacheControl.includes('no-store') && cacheControl.includes('public')) {
                page.headers['Cache-Tag'] = CacheKeyService.getCacheTags(request, requestRules);

                // Respects the cache-control header TTL that was present on the origin response
                await cache.put(cacheKey, page);
            }
        }
    }

    // If the page still isn't found, throw an error
    if (!page) {
        throw new Error('Page not found');
    }

    return page;
}

export async function getReverseProxyResponseFetchCacheApi(request: Request, requestRules: RequestRules, pageProviderUrl: string): Promise<Response> {
    const useCache = SecurityService.isBusinessIpRequest(request);
    const cacheKey = CacheKeyService.getCacheKey(request, pageProviderUrl);

    let page = await fetch(pageProviderUrl, {
        cf: {
            cacheTtl: useCache ? requestRules.reverseProxyTtl : undefined,
            cacheTtlByStatus: {
                '300-599': 0,
            },
            cacheKey: cacheKey,
            cacheTags: [CacheKeyService.getCacheTags(request, requestRules)],
        },
    });

    page = new Response(page.body, page);

    // Cache-Control is completely ignored by the tiered cache since we provided a TTL
    const cacheControl = page.headers.get('cache-control');

    // If the cache is not public, or set to no-store, don't cache
    if (!page.ok || (cacheControl && (!cacheControl.includes('public') || cacheControl.includes('no-store')))) {
        // How do we handle this?
        // await caches.default.delete(cacheKey);
        return page;
    }

    return page;
}