Using the Cache API

export default {
	async fetch(request, env, ctx) {
		const cacheUrl = new URL(request.url);

		// Construct the cache key from the cache URL
		const cacheKey = new Request(cacheUrl.toString(), request);
		const cache = caches.default;

		// Check whether the value is already available in the cache
		// if not, you will need to fetch it from origin, and store it in the cache
		let response = await cache.match(cacheKey);

		if (!response) {
			console.log(
				`Response for request url: ${request.url} not present in cache. Fetching and caching request.`,
			);
			// If not in cache, get it from origin
			response = await fetch(request);

			// Must use Response constructor to inherit all of response's fields
			response = new Response(response.body, response);

			// Cache API respects Cache-Control headers. Setting s-maxage to 10
			// will limit the response to be in cache for 10 seconds max

			// Any changes made to the response here will be reflected in the cached value
			response.headers.append("Cache-Control", "s-maxage=10");

			ctx.waitUntil(cache.put(cacheKey, response.clone()));
		} else {
			console.log(`Cache hit for: ${request.url}.`);
		}
		return response;
	},
};

interface Env {}
export default {
	async fetch(request, env, ctx): Promise<Response> {
		const cacheUrl = new URL(request.url);

		// Construct the cache key from the cache URL
		const cacheKey = new Request(cacheUrl.toString(), request);
		const cache = caches.default;

		// Check whether the value is already available in the cache
		// if not, you will need to fetch it from origin, and store it in the cache
		let response = await cache.match(cacheKey);

		if (!response) {
			console.log(
				`Response for request url: ${request.url} not present in cache. Fetching and caching request.`,
			);
			// If not in cache, get it from origin
			response = await fetch(request);

			// Must use Response constructor to inherit all of response's fields
			response = new Response(response.body, response);

			// Cache API respects Cache-Control headers. Setting s-maxage to 10
			// will limit the response to be in cache for 10 seconds max

			// Any changes made to the response here will be reflected in the cached value
			response.headers.append("Cache-Control", "s-maxage=10");

			ctx.waitUntil(cache.put(cacheKey, response.clone()));
		} else {
			console.log(`Cache hit for: ${request.url}.`);
		}
		return response;
	},
} satisfies ExportedHandler<Env>;

from workers import WorkerEntrypoint
from pyodide.ffi import create_proxy
from js import Response, Request, URL, caches, fetch

class Default(WorkerEntrypoint):
    async def fetch(self, request):
        cache_url = request.url

        # Construct the cache key from the cache URL
        cache_key = Request.new(cache_url, request)
        cache = caches.default

        # Check whether the value is already available in the cache
        # if not, you will need to fetch it from origin, and store it in the cache
        response = await cache.match(cache_key)

        if response is None:
            print(f"Response for request url: {request.url} not present in cache. Fetching and caching request.")
            # If not in cache, get it from origin
            response = await fetch(request)
            # Must use Response constructor to inherit all of response's fields
            response = Response.new(response.body, response)

            # Cache API respects Cache-Control headers. Setting s-max-age to 10
            # will limit the response to be in cache for 10 seconds s-maxage
            # Any changes made to the response here will be reflected in the cached value
            response.headers.append("Cache-Control", "s-maxage=10")
            self.ctx.waitUntil(create_proxy(cache.put(cache_key, response.clone())))
        else:
            print(f"Cache hit for: {request.url}.")
        return response

import { Hono } from "hono";
import { cache } from "hono/cache";

const app = new Hono();

// We leverage hono built-in cache helper here
app.get(
	"*",
	cache({
		cacheName: "my-cache",
		cacheControl: "max-age=3600", // 1 hour
	}),
);

// Add a route to handle the request if it's not in cache
app.get("*", (c) => {
	return c.text("Hello from Hono!");
});

export default app;