FrontendHaltNetworking·Intermediate·Conceptual·1 min read
How does request deduplication work and why does it matter?
Short interview answer
The data layer keys requests by their parameters and returns the same in-flight promise to every caller of the same key, so ten components mounting and each asking for the current user produce one network request. Without it, unrelated components independently refetch the same data.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.