How do you implement caching at the CDN level with GraphQL?

You must use HTTP GET for queries and manage Cache-Control headers, often combining with APQ or Edge Caching.

CDNs only cache GET requests. Standard GraphQL sends POST requests. To utilize CDNs (like Cloudflare/Fastly), clients must send queries via GET (query string in URL). The GraphQL server can then calculate the Cache-Control max-age by analyzing the requested fields (taking the lowest max-age of all requested fields) and return it in the header.