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Spring / Spring gRPC Interview Questions

What role does HTTP/2 play in gRPC?

HTTP/2 is the transport layer gRPC is built on, and several of its features are what make gRPC's performance and streaming model possible.

Multiplexing lets many independent request/response streams share a single TCP connection without one slow call blocking others (no head-of-line blocking at the application layer). HPACK header compression reduces the overhead of repeated metadata on every call. Binary framing makes parsing faster and more predictable than text-based HTTP/1.1.

Critically, HTTP/2's support for long-lived, full-duplex streams is what allows gRPC's server-streaming, client-streaming, and bidirectional-streaming call types to exist at all - each logical RPC maps onto an HTTP/2 stream that can carry multiple messages in either direction before it closes.

Which HTTP/2 feature lets gRPC run many calls over a single TCP connection concurrently?
What does HTTP/2 header compression (HPACK) primarily reduce?

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