Cloudflare Developers•15mo ago

How to Cache API response, with Hono JS & workers

Hello all newbie here, I am making an API where in an endpoint I am calling a third party API and sending a JSON response to the client. I tried adding cache headers to the fetch API, but I am not able to see any cf-cache-status in the headers. My approach

 
app.get('/', async (c) => {
  const res = await homeController();
  return c.json(res);
});

 
app.get('/', async (c) => {
  const res = await homeController();
  return c.json(res);
});

Home controller calls the api

const homeController = async () => {
  const res = await fetch('example.com', {
    method: 'GET',
    cf: {
      cacheEverything: true,
      cacheTtlByStatus: {
        '100-199': 0,
        '200-299': 14400,
        '300-599': 0,
      },
    },
    headers: {
      'Cache-Control': 'public, max-age=14400',
    },
  });
  const data = await res.json();
  return data;
};

const homeController = async () => {
  const res = await fetch('example.com', {
    method: 'GET',
    cf: {
      cacheEverything: true,
      cacheTtlByStatus: {
        '100-199': 0,
        '200-299': 14400,
        '300-599': 0,
      },
    },
    headers: {
      'Cache-Control': 'public, max-age=14400',
    },
  });
  const data = await res.json();
  return data;
};

i have set the cache-control headers, but cannot see the cf-cache-status header can anyone tell me what am i doing wrong. also i am not using fetch exported by cloudflare.

10 Replies

kian•15mo ago

You're not returning the response headers from your fetch request, only the body. If you're not modifying the body or checking any of it's properties, you can just return the response in homeController and return that in your Hono handler.

afkOP•15mo ago

so you are suggesting instead of data i should return the entire response ?

kian•15mo ago

If you want to see the original response headers, yeah.

afkOP•15mo ago

sure i will try that and and update here This did not work

Cyb3r-Jak3•15mo ago

I'm confused. Are you trying to see the cache status of the sub request in your response?

afkOP•15mo ago

@Cyb3r-Jok3 yes i am not seeing any thing related to cache header, also i dont think the responses are being cached so there is no way to verify Also wanted to know if my implementation is correct or am i doing some mistake hello @Chaika can you also have a look at my issue i have been waiting for someone to point what i am doing wrong please help me out i read through some of your older answers as well tried to implement that i understood but it still doesn't seems to work sorry for tagging but i am stuck and no one is replying after a single message

Cyb3r-Jak3•15mo ago

You are just returning the JSON data not a response with cache headers. Try using return c.json(res, headers: {'cache-control': 'max-age=3600'});

afkOP•15mo ago

understood, @Cyb3r-Jok3 this cache header i have added not and this shows up but cf-cache-status doesnt shows up in header so i have no idea if its already cached in edge or not.

Cyb3r-Jak3•15mo ago

cf-cache is a specfic header from cloudflare that indicate cache status. Workers run before the cache so the header will no be present unless you add it

Adi•15mo ago

Just as an FYI, you can also use Hono's cache middleware - https://hono.dev/middleware/builtin/cache It does mostly the same thing as others have already suggested

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How to Cache API response, with Hono JS & workers

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