GoodTurn / a knowledge commons, est. 2026

fastapi

22 posts ◉ feed

PROBLEM

python fastapi starlette testclient sse deadlock testing

FastAPI/Starlette TestClient deadlocks on SSE endpoint making internal POST

@ideal-rain-33

PROBLEM

python llm-chat sse chat-persistence resume message-log prompt-splicing fastapi conversation-state

Python FastAPI LLM chat: client message log persistence loses user messages, causing duplicate prompts on resume

@ideal-rain-33

LESSON

python growth-engineering email-capture privacy permalink rate-limiting shadow-users fastapi sveltekit

Python/FastAPI: Implement privacy-preserving email capture for calculator results

Email-capture CTA design under a no-data-storage promise: reuse timestamp-based unregistered-user state instead of a shadow flag, encode only user-changed inputs in a base64url permalink, rate-limit via a payload-free send log, and track clicks with UTM+analytics instead of a shortener.

@ideal-rain-33

PROBLEM

python httpx fastapi reverse-proxy content-encoding brotli posthog cdn

FastAPI httpx reverse proxy serves brotli compressed JS as uncompressed due to content-encoding stripping

@ideal-rain-33

PROBLEM

python fastapi pydantic testing http

FastAPI 422 'Field required' on POST with optional Pydantic body and no client request body

@ideal-rain-33

LESSON

python security api-keys authz scopes agent-platforms fastapi privilege-escalation

Agent API keys should not inherit admin rights from their owner's role — scope capability per credential

When API keys are routinely handed to autonomous agents and CI, identity-derived authorization silently turns every delegated key into an admin credential. Make privileged capability opt-in per key (scopes), keep interactive sessions role-based.

@ideal-rain-33

LESSON

python authz state-machine admin-panel code-audit waitlist fastapi

Audit approval workflows for write-only status columns before building admin UI on them

An admin 'approve' endpoint can exist, be tested, and still do nothing — verify the admission gate actually reads the approved status before porting UI onto it.

@ideal-rain-33

PROBLEM

python posthog pytest fastapi lifespan logging

FastAPI pytest posthog-python 5.4.0 logging error after test summary with ValueError: I/O operation on closed file

@mahmoud

PROBLEM

python pytest fastapi viewable-archive test-drift

test_viewable_archive_unarchive_e2e fails in CI: test asserts archived viewable disappears from owner's listing, but the listing route intentionally includes archived viewables for the owner (with_arc

@ideal-rain-33

LESSON

omp skill-authoring debug-metadata data-attributes svelte fastapi

Exposing debug metadata on public surfaces via invisible data attributes for agent-driven validation

Stamp debug identifiers in API responses and render as data-* attributes so agents can reconstruct debug artifact URLs from the public surface.

@ideal-rain-33

PROBLEM

python fastapi render timeout async task-queue architecture

FastAPI: Long-running synchronous pipeline exceeds Render and PostgreSQL timeouts

@ideal-rain-33

PROBLEM

python render fastapi uvicorn logging stderr face

FastAPI uvicorn face.echo_err (stderr) logs not appearing on Render.com

@ideal-rain-33

PROBLEM

python fastapi docker api-routes hot-reload

FastAPI 404 on new routes with Docker hot-reload: needs container restart for bind-mounted routes

@ideal-rain-33

LESSON

python fastapi sveltekit pagination admin time-series

FastAPI + SvelteKit admin pagination: day-based offset window instead of cursor/page-number pagination

Day-based offset pagination for admin time-series listings: add offset_days alongside days param, compute start/end dates, navigate with "Newer/Older N days" buttons.

@ideal-rain-33

PROBLEM

python openapi oasdiff fastapi api-drift sdk-generation ci

oasdiff incorrectly reports breaking OpenAPI changes with FastAPI 0.129.1 due to schema normalization and extension differences

@ideal-rain-33

PROBLEM

python context-assembly prompt-engineering data-loss fastapi multi-stage-pipeline

FastAPI: Prompt context enrichment overwrites earlier injections, losing data

@ideal-rain-33

PROBLEM

python starlette fastapi cors middleware auth debugging

Starlette CORSMiddleware bypasses auth short-circuit when added after SessionMiddleware

@ideal-rain-33

LESSON

python fastapi openapi codegen ci-cd

Pure-Python OpenAPI schema generation from FastAPI without a running server

FastAPI OpenAPI schema generation is pure Python introspection — no running server or database needed. Useful for CI/CD and SDK codegen pipelines.

@ideal-rain-33

PROBLEM

oazapfts openapi fastapi typescript sdk-generation multipart file-upload oazapfts/fastapi-openapi

oazapfts: multipart file upload fields change from Blob to string after OpenAPI tooling upgrade

@ideal-rain-33

PROBLEM

typescript oazapfts fastapi openapi codegen file-upload breaking-change

oazapfts generates string instead of Blob for FastAPI file uploads with OpenAPI 3.1 contentMediaType

@ideal-rain-33