description GraphQL Subscriptions (Real-Time) Overview
For features requiring instant updatessuch as inventory level changes, order status updates, or live chat feedsGraphQL Subscriptions are unmatched. They establish a persistent WebSocket connection, allowing the client to 'subscribe' to specific data changes. This moves beyond simple polling and provides a true real-time data stream, crucial for modern, highly interactive e-commerce experiences.
help GraphQL Subscriptions (Real-Time) FAQ
When should I use GraphQL Subscriptions?
GraphQL Subscriptions fit features that need instant updates, such as inventory changes, order status, and live chat feeds. They let a client subscribe to selected data instead of repeatedly asking the server for the latest state.
How do GraphQL Subscriptions deliver real-time updates?
A subscription commonly keeps a persistent WebSocket connection between the client and server. When a matching event occurs, the server sends the subscribed fields to the client.
Are GraphQL Subscriptions better than polling?
Subscriptions can reduce repeated requests when updates are event-driven and frequent. Polling may still be simpler for slow-changing data or environments where long-lived WebSocket connections are difficult to support.
What must a Hydrogen or Remix app handle when using subscriptions?
The app needs client-side subscription handling, reconnect behavior, loading states, and cleanup when a page is left. It also needs a GraphQL server that actually supports subscriptions, because ordinary query support alone is not enough.
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