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GraphQL Subscriptions for Federation

The Cosmo Router comes with subscription support out of the box without any limitations. We support two different protocols to enable the most versatile data synchronization: WebSockets, Server-Sent Events.

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Websockets

We support suobscriptions over websocket using graphql-ws (GraphQL over WebSocket Protocol compliant server and client) or graphql-transport-ws (Legacy).

Server-Sent Events

One-Way Messaging. Both with GET and POST requests. Recommended for unidirectional updates. More resource efficient than WebSockets.

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