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How to configure Cloudflare caching for a SvelteKit endpoint?

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Oct 18.2023

I want Cloudflare CDN to cache GET responses from a SvelteKit server endpoint using the cloudflare-adapter. The goal is for users to receive the same cached response if it was previously requested by someone else. When the TTL expires, Cloudflare should fetch a new response from the endpoint. How can I achieve this?

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Davinci•003 auto-replyConfiguring Cloudflare caching for a SvelteKit endpoint involves setting up page rules in your Cloudflare dashboard and configuring your SvelteKit server to send the appropriate caching headers.

Here's a step-by-step guide:

1. **Set up Cloudflare Page Rules**

Go to your Cloudflare dashboard, select your site, and navigate to the "Page Rules" section. Create a new page rule for the path of your SvelteKit endpoint (e.g., https://yourdomain.com/endpoint*). In the settings, choose "Cache Level" and set it to "Cache Everything". This tells Cloudflare to cache the responses from your SvelteKit endpoint.

2. **Configure SvelteKit to Send Caching Headers**

In your SvelteKit server, you need to set the Cache-Control header for the responses from your endpoint. This tells Cloudflare how long to cache the response. Here's an example of how to do this in a SvelteKit endpoint:

``javascript
export async function get(request) {
const data = await fetchData(); // Fetch your data here

return {
body: data,
headers: {
'Cache-Control': 'public, max-age=3600', // Cache for 1 hour
},
};
}
`

In this example, the
Cache-Control header is set to public, max-age=3600, which tells Cloudflare to cache the response for 1 hour.

Remember, the effectiveness of caching depends on the nature of your data. If your data changes frequently, you might want to set a lower
max-age. If your data rarely changes, you can set a higher max-age` to benefit more from caching.

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