GraphQL Subscriptions
GraphQL subscriptions let clients open a persistent connection and receive server-pushed updates when data they selected changes. The server streams events that match a subscription document, so dashboards, chat, and collaborative views refresh without polling a query endpoint.
Technical Architecture & Deep-Dive
Unlike one-shot queries, subscriptions keep a channel open, often over WebSockets or HTTP streaming. Resolvers publish events when underlying data changes, and the GraphQL layer maps those events to the client subscription shape.
Subscriptions add operational complexity: connection auth, fan-out, and backpressure differ from stateless POST queries. Many teams pair GraphQL subscriptions with a gateway that authenticates sockets, rate limits reconnect storms, and proxies to internal pub/sub buses while clients still speak one secure URL.
Key Architectural Benefits
Implement GraphQL Subscriptions at the Edge
Deploy lightweight API aggregation, edge caching, and secret injection in minutes without Docker containers or complex servers.
Frequently Asked Questions
Q:How do GraphQL subscriptions differ from server-sent events?
Subscriptions are part of the GraphQL protocol and mirror query field selection. Server-sent events are generic HTTP streams that do not require a GraphQL server.
Q:Can subscriptions run behind an API gateway?
Yes. Gateways can upgrade connections, validate tokens, and forward subscription traffic to upstream GraphQL nodes.
Related Architecture Concepts
GraphQL is a query language and runtime for APIs in which clients send a query describing exactly the fields they need, and the server returns JSON matching that shape. A strongly typed schema defines available data, and a single endpoint replaces many REST routes.
A WebSocket API keeps an open, bidirectional TCP connection between client and server so both sides can send messages at any time without opening a new HTTP request per event. It suits live dashboards, chat, collaborative editing, and streaming AI tokens.
Server-Sent Events (SSE) is a web standard that lets a server push a continuous stream of text events to a client over a single long-lived HTTP connection. Browsers consume SSE with the EventSource API, and it is widely used to stream AI model tokens and live updates.
An API Gateway is a single entry point that sits between client applications and backend services. It routes requests, enforces authentication and rate limits, transforms payloads, and aggregates responses so clients talk to one stable endpoint instead of many internal APIs.
Ready-to-Use Edge Recipes
Linear payloads are heavy for React Native. Pick issue id title state assignee from GraphQL response. RealComposer output mapping returns only the fields your UI needs at the edge.
To cache linear api graphql queries at edge, put a TTL cache on your RealComposer pipeline. Cache issue list queries with stale-while-revalidate pattern. Shared edge cache absorbs repeat traffic before it reaches Linear.
Anthropic payloads are heavy for Frontend / Web. Edge strips rate limit headers and debug from streamed JSON chunks. RealComposer output mapping returns only the fields your UI needs at the edge.