Does GraphQL break HTTP caching? Here's what POST gives up.

GraphQL does not inherently prevent HTTP caching, but conventional POST requests to a single `/graphql` endpoint place operations and variables in the request body, which ordinary shared caches generally do not use to distinguish cache entries or serve cached POST responses. Sending read-only queries over GET restores a cacheable URL-based request shape, while persisted document IDs or hashes keep URLs shorter and can restrict executable operations when implemented as enforced build-time safelists; Automatic Persisted Queries, by contrast, primarily reduce bandwidth and do not prevent arbitrary queries. Effective GraphQL edge caching still requires explicit cache policies, correct cache keys that include all response-affecting inputs such as variables, locale, tenant, and operation identity, and careful handling of CDN-specific behavior and URL-length limits. Public and viewer-specific data should be separated, with personalized responses marked private or no-store and authorization handled before protected results are served, since incorrectly keyed or overly permissive shared caches can expose data across users. The discussion distinguishes HTTP response caching from gateway, resolver, client-side normalized, and request-scoped batching caches, concluding that GraphQL removes REST’s convenient resource-URL default rather than breaking HTTP caching itself.

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