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One JSON blob born at Pacco's gateway rides the Correlation-Context HTTP header into services and the message_context AMQP header across the bus, surfacing in SignalR pushes - carried by a class copy-pasted into eleven repos and a broker that forwards exactly one header.
Pacco ships a second API gateway built on Ocelot that hand-rolls everything the Ntrada YAML declares - auth bypass, async bus routes, edge-minted IDs, correlation headers - plus the estate's only circuit breakers. It is instructive, revealing, and deployed by absolutely nothing.
Pacco's Ntrada gateway is ninety lines of C# and five hundred of YAML, and swapping one route key - use downstream for use rabbitmq - turns the same HTTP surface from a proxy into a bus publisher answering 202. The two compose files disagree about which one you get.
Thirteen repositories, one umbrella that runs twelve of them, two interchangeable API gateways and a service that watches everything - the Pacco estate read as a system of systems, and the fifteen-part series it earns.
DShop's gateway answers a write with 202 Accepted and a header pointing at an operation that hasn't happened yet. Reading the contract shows a clean async-REST design - and two small bugs that undercut it.
DShop puts all its authorization at the gateway and none in the services behind it - then publishes every service port to the host. The compose file quietly defeats the entire security model.
DShop.Api.Next rebuilds the whole code-first gateway as Ntrada configuration - a 17-line Program.cs and a folder of YAML. Reading both side by side shows exactly what you trade when a gateway becomes data.
DShop's gateway reads over HTTP and writes over a message bus - two dispatch mechanisms behind one controller. Reading it shows how a gateway can be a router and a publisher at the same time.
DevMentors built the same e-commerce shop twice - once as a monolith, once as nine services - with two gateways and two frontends. This series reads the whole estate as one artefact.
