FastAPI: Mounting Independent Sub-Applications
Mounting delegates a URL prefix to a separate FastAPI app, giving it its own isolated logic and API docs. Use it to combine microservices or isolate domains. The footgun: the main app's dependencies and middleware do not apply to the sub-app.
Mounting in FastAPI delegates a URL prefix to a completely separate application. This sub-app operates in isolation, with its own OpenAPI schema, API docs, dependencies, and middleware. This is ideal for composing a system from independent microservices behind a single gateway or for cleanly separating large business domains within a monolith. The footgun is assuming shared context; the main app's dependencies and middleware do not cascade down to the mounted sub-app.
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