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feat(infra): support tiered caching

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Collin Barrett 2025-06-20 05:03:33 -05:00 committed by Collin Barrett
parent 3ffc0d2091
commit db4b1f3bb2
2 changed files with 21 additions and 28 deletions
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29
infra/cloudflare-workers/filterlists-api-host-rewrite-worker.js
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@ -1,34 +1,23 @@
/**
* Cloudflare Worker for api.filterlists.com
*
* This worker enables two key functionalities:
* 1. Azure App Service Free Tier Custom Domain: Proxies requests to `app-filterlists-directory-prod.azurewebsites.net`, allowing a custom domain (`api.filterlists.com`) with Azure's free tier.
* 2. Respect Origin Cache-Control: Ensures Cloudflare's edge cache (via Cache API) honors the `Cache-Control` headers sent by the origin for all successful responses, optimizing caching for JSON APIs and static assets.
*/
export default {
async fetch(request, _, ctx) {
const cache = caches.default;
const cacheKey = request;
let response = await cache.match(cacheKey);
if (response) {
return response;
}
async fetch(request, _, __) {
const url = new URL(request.url);
const azureHostname = "app-filterlists-directory-prod.azurewebsites.net";
const originUrl = `https://${azureHostname}${url.pathname}${url.search}`;
const originRequest = new Request(originUrl, request);
// HACK: trick Azure App Service free tier into supporting custom domain
originRequest.headers.set("Host", azureHostname);
response = await fetch(originRequest);
if (response.ok) {
const responseToCache = response.clone();
ctx.waitUntil(cache.put(cacheKey, responseToCache));
}
const response = await fetch(originRequest, {
cf: {
// force tiered edge caching for API responses
cacheEverything: true,
},
});
return response;
},

20
infra/cloudflare-workers/filterlists-next-host-rewrite-worker.js
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@ -1,21 +1,25 @@
/**
* Cloudflare Worker for next.filterlists.com
*
* Azure App Service Free Tier Custom Domain: Proxies requests to `app-filterlists-web-prod-h2hecsdqbrach3dt.eastus2-01.azurewebsites.net`, allowing a custom domain (`next.filterlists.com`) with Azure's free tier.
*/
export default {
async fetch(request, _, __) {
const url = new URL(request.url);
const azureHostname = "app-filterlists-web-prod-h2hecsdqbrach3dt.eastus2-01.azurewebsites.net";
const azureHostname =
"app-filterlists-web-prod-h2hecsdqbrach3dt.eastus2-01.azurewebsites.net";
const originUrl = `https://${azureHostname}${url.pathname}${url.search}`;
const originRequest = new Request(originUrl, request);
// re-write Host header to trick App Service free tier into supporting custom domain
// HACK: trick Azure App Service free tier into supporting custom domain
originRequest.headers.set("Host", azureHostname);
// delete cookie to trick Cloudflare into caching static HTML
originRequest.headers.delete('cookie');
return await fetch(originRequest);
const response = await fetch(originRequest, {
cf: {
// force tiered edge caching for server components, next.js pages, etc.
cacheEverything: true,
},
});
return response;
},
};