The Async Arrow
summary
Builds an async arrow in F# — a function Request -> Async<Response> — then composes reusable filters (examples: before/after/mapIn/mapOut) to add logging, extract response to string, attach a bearer token, retry with exponential backoff and surface errors, all without running the async until the end. Uses async monad operations (map/bind) and function composition for HTTP calls and event processors; composition reduces tangled cross‑cutting code and improves targeted debugging.
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