9 micro-topics in Services & APIs, each with the evidence that proves you have it and the written reason behind every link. Before you start, it rests on 5 other domains. Downstream, it holds up 6 domains.
9 topics · depth 0–8 of 16 · 9 internal links · 6 in · 6 out
Load-bearing links first. Each one says what in this domain rests on what outside it, and why.
2 links
Bind request bodies to models rests on Define schemas with Pydantic
Request bodies are validated by models.
Declare response models rests on Control serialization
Responses are serialized models.
1 link
Route requests in FastAPI rests on Choose HTTP methods
A route binds a method and a path.
1 link
Log requests with correlation rests on Emit structured logs
Request logging is structured logging applied at the edge.
1 link
Route requests in FastAPI rests on Write async Python
Handlers are async functions.
1 link
Manage lifespan and pooling rests on Manage secrets and environment config
Startup is where credentials are loaded.
In prerequisite order. Each idea names the artifact that closes it, the market demand that put it on the map, and what it stands on.
Depth 0 · conceptual · scaffolded · M16 §16.4
Protects upstreams and budgets from abuse
Both are edge policies applied before the handler.
Depth 6 · procedural · unassisted · M16 §16.1
Declares paths, methods and parameters
Write async Python · Production Python
Handlers are async functions.
Choose HTTP methods · HTTP
A route binds a method and a path.
Depth 7 · procedural · unassisted · M16 §16.1
Parses and validates input automatically
Bodies are bound to routes.
Define schemas with Pydantic · Validation & Pydantic
Request bodies are validated by models.
Depth 7 · conceptual · scaffolded · M16 §16.1
Shares resources and enforces preconditions
Dependencies are injected into handlers.
Depth 7 · procedural · unassisted · M16 §16.4
Emits structured logs tied to a request id
Emit structured logs · Observability
Request logging is structured logging applied at the edge.
You log the requests your routes receive.
Depth 7 · conceptual · scaffolded · M16 §16.5
Defers work after the response
Background work is scheduled from a handler.
Depth 8 · representational · unassisted · M16 §16.1
Constrains and documents what goes out
Response models are the outbound half.
Control serialization · Validation & Pydantic
Responses are serialized models.
Depth 8 · procedural · unassisted · M16 §16.4
Applies API keys or tokens at the edge
Auth is enforced as a dependency.
Depth 8 · conceptual · scaffolded · M16 §16.5
Opens and closes shared resources cleanly
Shared resources are what dependencies hand out.
Both concern work outside the request cycle.
Manage secrets and environment config · Delivery & CI/CD
Startup is where credentials are loaded.
Everything downstream that names an idea here as a prerequisite, grouped by where it lives.
1 link
Run an agent loop rests on Route requests in FastAPI
The tools it calls have to be served.
1 link
Load-test a service rests on Route requests in FastAPI
You load-test a running service.
1 link
Serve server-sent events rests on Route requests in FastAPI
A stream is served from a route.
1 link
Test API endpoints rests on Route requests in FastAPI
You test endpoints that exist.
1 link
Expose capability over MCP rests on Route requests in FastAPI
A server exposes the tools.
1 link
Apply middleware rests on Authenticate API requests
Auth at the edge is the same idea in another runtime.
Retool. Retrain. Relaunch.
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