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The Send facade is a struct, its methods return a fake Void, and every sender secretly marks the response started before writing a byte. A tour of the response surface the deep dive skipped - files, ranges, redirects, interceptors and all. Part 2 of FastEndpoints — The Missing Chapters.
Every downstream response is buffered into a UTF-16 string and re-encoded on the way out, so binary bodies corrupt silently behind a plausible status code and a recomputed Content-Length.
AssignVehicleToOrder is the one command in Pacco that cannot finish alone - Orders calls Vehicles, then Pricing, and Pricing calls Customers, a synchronous enrichment chain on the write path of a messaging estate. At the end of it sits a deliberately bus-less calculator with a loyalty ladder, an unassigned Id and a discount logged in dollars.
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.Common's error middleware maps every exception to HTTP 400, computes a safe message, then throws it away and serialises the raw exception text to the caller.
