gRPC: how a local call becomes a network request

<p>Suppose you run a ride-hailing app with five services: trip, dispatch, location, pricing, and payments.</p> <p>The trip service owns each ride. Dispatch matches riders to nearby drivers. Location tracks driver positions.</p> <p>Pricing quotes the fare. Payments charges the card.</p> <p>When a rider taps Find a ride, the trip service calls dispatch to find a driver. The first version of that cal

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