import { getAssetFromKV, mapRequestToAsset, } from "@cloudflare/kv-asset-handler"; /** * The DEBUG flag will do two things that help during development: * 1. we will skip caching on the edge, which makes it easier to * debug. * 2. we will return an error message on exception in your Response rather * than the default 404.html page. */ const DEBUG = false; addEventListener("fetch", (event) => { try { event.respondWith(handleEvent(event)); } catch (e) { if (DEBUG) { return event.respondWith( new Response(e.message || e.toString(), { status: 500, }) ); } event.respondWith(new Response("Internal Error", { status: 500 })); } }); async function handleEvent(event) { const url = new URL(event.request.url); let options = {}; /** * You can add custom logic to how we fetch your assets * by configuring the function `mapRequestToAsset` */ // options.mapRequestToAsset = handlePrefix(/^\/docs/) try { if (DEBUG) { // customize caching options.cacheControl = { bypassCache: true, }; } return await getAssetFromKV(event, options); } catch (e) { // if an error is thrown try to serve the asset at 404.html if (!DEBUG) { try { let notFoundResponse = await getAssetFromKV(event, { mapRequestToAsset: (req) => new Request(`${new URL(req.url).origin}/404.html`, req), }); return new Response(notFoundResponse.body, { ...notFoundResponse, status: 404, }); } catch (e) {} } return new Response(e.message || e.toString(), { status: 500 }); } } /** * Here's one example of how to modify a request to * remove a specific prefix, in this case `/docs` from * the url. This can be useful if you are deploying to a * route on a zone, or if you only want your static content * to exist at a specific path. */ function handlePrefix(prefix) { return (request) => { // compute the default (e.g. / -> index.html) let defaultAssetKey = mapRequestToAsset(request); let url = new URL(defaultAssetKey.url); // strip the prefix from the path for lookup url.pathname = url.pathname.replace(prefix, "/"); // inherit all other props from the default request return new Request(url.toString(), defaultAssetKey); }; }