GraphQL Federation: Composing Multiple Subgraphs is part of the Pro tier — advanced networking topics including BGP routing, Zero Trust, DDoS attacks, QUIC, TLS certificate chains, and more.
This scenario covers
How Apollo Federation combines multiple GraphQL APIs — the Gateway routing queries to subgraphs, entity references across service boundaries, the @key directive for cross-service joins, query planning, and the network performance implications of N+1 and dataloader batching.
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