Graph/09bb9ffe-d9c9-43e8-9b01-1bbdec5af449

Domainunvalidated

OpenAPI

09bb9ffe-d9c9-43e8-9b01-1bbdec5af449

OpenAPI

Node Details

Public graph metadata

Updated4/30/2026

PageRank0.0005

Effectiveness0.000

Connections

50 linked nodes

IMPLEMENTATION_OFPackage

fastapi

IMPLEMENTATION_OFComponent

fastapi

IMPLEMENTATION_OFLanguage

fastapi

PERTAIN_TOProblem

Running the Uvicorn CLI with typical FastAPI arguments (e.g., main:app, --port, --host, --reload) fails with "uvicorn: error: unrecognized arguments". The server launch never starts correctly.

PERTAIN_TOProblem

I have an endpoint that takes a Pydantic model, `Foo`, as a query parameter. Outcome: parsing fails even without nesting.

PERTAIN_TOSolution

Parse your dictionary from the query — When `baz` will receive the Json string, it will be parsed into a dictionary. Tension: This method changes the openapi schema, so swagger will render `baz` as a file input. Outcome: you can use your custom Json loader type that will render as a textarea.

PERTAIN_TOSolution

You can use `@model_serializer` to achieve this: — This will work as a FastAPI response model. Tension: but will still generate an unnested JSON schema in the OpenAPI documentation. Outcome: return {k: v for k, v in model_iter(self)}.

PERTAIN_TOProblem

there's no way to set auth tokens in the docs — implement a basic `Bearer` Authorization in FastAPI.

PERTAIN_TOSolution

You can use a global dependency: — FastAPI. Tension: there's no way to set auth tokens in the docs. Outcome: app.openapi = custom_openapi.

PERTAIN_TOProblem

Pytest async tests for a FastAPI app fail with RuntimeError: “Task got Future attached to a different loop” when interacting with the database via SQLAlchemy.

PERTAIN_TOProblem

The deserialized object is ~ 100 MB. — My JSON request is about 20 MB. Tension: This is too much memory and I am inclined to parse / validate my requests in a stream-based fashion. Outcome: However, I would still be glad if FastAPI could handle generation of the OpenAPI spec based on the Pydantic model.

PERTAIN_TOProblem

the first relationship is always automatically loaded although it shouldn't — using SQLAlchemy and Pydantic with a Postgres-Database. Tension: The second relationship works as expected. Outcome: I am going to have two different endpoints.

PERTAIN_TOSolution

I wrote another Schema that does not contain such attributes — In order to NOT retrieve nested objects of one-2-many relations. Tension: one that contains only basic attributes for a flat response. Outcome: one that contains the relationships.

PERTAIN_TOProblem

How to serve a machine-learning model via FastAPI using dependencies when the model must be held in a stateful class instance that is updated on a schedule, rather than recreated per request.

PERTAIN_TOSolution

Create a lifespan-managed shared state (e.g., instantiate a state manager/model in FastAPI lifespan) and store the loaded model in that state so request handlers can access it via Request/app state or a dependency that reads from lifespan.

PERTAIN_TOProblem

However, SwaggerUI does not: — Redoc generates a documentation that perfectly describes the parameters as Optional and Required with the correct decsription. Tension: I'm unable to find any solution on Internet. Outcome: This approach will work better in Swagger UI.

PERTAIN_TOSolution

you can create a Pydantic model for the request body and manually specify the required and optional nature of fields. Tension: Swagger UI might struggle to render such information as expected. Outcome: Then, use this model with detailed descriptions in a way that works for both Swagger UI and ReDoc.

PERTAIN_TOSolution

works as you expect on Starlette 0.28.0 — on Starlette 0.29.0. Tension: but doesn't log exception on Starlette 0.29.0. Outcome: I think you should ask this question on https://github.com/encode/starlette.

PERTAIN_TOProblem

I want to disable redoc so that users can't see the APIs list. — in the product environment. Tension: I have overridden the redoc endpoint in my API but it is still coming. Outcome: How can I fix it?

PERTAIN_TOSolution

in the product environment. Tension: I want to disable redoc so that users can't see the APIs list. Outcome: app = FastAPI(redoc_url=None).

PERTAIN_TOSolution

Also, you could determine is it production or development stage by env variable in settings: — in production you should change environment to `production`. Tension: After this, you can disable redoc by this env:.

PERTAIN_TOProblem

FastAPI returns a 422 Unprocessable Entity error for a UUID path parameter when building the parameter as a modular dependency using `Path(alias=...)`.

PERTAIN_TOSolution

Do not use `alias` with `Path` parameters in this setup; rely on the function parameter name for the path variable. If you need different naming only in Swagger/UI, customize/override the generated OpenAPI schema instead of using `alias`.

PERTAIN_TOProblem

GCP API Gateway only supports the OpenAPI version 2.0 specification. Outcome: This mismatch necessitates a manual conversion of the OpenAPI document to version 2.0.

PERTAIN_TOSolution

This mismatch necessitates a manual conversion of the OpenAPI document to version 2.0 — before it can be utilized by API Gateway. Tension: Incompatibility issue between the OpenAPI document supported by GCP API Gateway, and the OpenAPI document automatically generated from FastAPI itself. Outcome: The Solution: For this will be clearly explained in the Link.

PERTAIN_TOProblem

Protect FastAPI routes so that authenticated users without the required permissions/roles cannot access specific endpoints.

PERTAIN_TOSolution

Implement role-based authorization as a reusable dependency (e.g., a callable class used with Depends) that loads the current user from the token and raises HTTP 403 when the user's role is not in the allowed roles; apply the dependency to routes.

PERTAIN_TOProblem

FastAPI cannot choose the correct model for a Union request body when one variant has an enum field

PERTAIN_TOSolution

Add model_config = ConfigDict(extra="forbid") to all models so unknown fields fail validation

PERTAIN_TOSolution

Use discriminated unions to give FastAPI criteria for selecting the right model

PERTAIN_TOSolution

Define a TypeAlias with Annotated[..., Field(union_mode='left_to_right')] and use it instead of a bare Union

PERTAIN_TOProblem

After upgrading a Gradio app, visiting it in the browser triggers ASGI server errors, including `ValueError: too many values to unpack (expected 2)` within the Uvicorn/FastAPI request handling stack.

PERTAIN_TOProblem

FastAPI does not know about Lizard, Dog and Cat schemas in OpenAPI

PERTAIN_TOSolution

Use model_json_schema(ref_template="#/components/schemas/{model}") instead of schema() when building openapi_extra

PERTAIN_TOProblem

Running pytest tests with FastAPI triggers a DeprecationWarning from httpx: the 'app' shortcut is deprecated and should use explicit transport configuration. The warning occurs when creating TestClient in a fixture.

PERTAIN_TOSolution

Upgrade/downgrade FastAPI (and underlying Starlette) to compatible versions, e.g., reinstall with a specific FastAPI version such as fastapi==0.115.6 after uninstalling fastapi/starlette/pydantic.

PERTAIN_TOProblem

After moving SQL endpoints from `main.py` into an `APIRouter` in `analytics.py`, database dependencies that worked in `main.py` no longer function correctly and errors occur (e.g., import/circular dependency issues).

PERTAIN_TOSolution

Move the dependency definitions (e.g., `get_database`, `get_db_connection`) into a separate module (e.g., `dependencies.py`) and adjust lifecycle/state usage to store the pool in and read it from `request.state` instead of `app.state` (optionally returning the pool from the lifespan context).

PERTAIN_TOSolution

Deploy the FastAPI server as an HTTP service (no manual HTTPS/TLS configuration) and let Render handle TLS termination; ensure Uvicorn runs with the correct host (0.0.0.0) and the PORT environment variable.

PERTAIN_TOProblem

In a FastAPI endpoint that accepts a Pydantic model, the caller can supply all model fields (including `id`), but the user wants to allow only `name` to be provided while keeping `id` server-generated. Attempting to use `Body(include=['id'])`/type-level inclusion breaks FastAPI/Pydantic validation and error handling behavior.

PERTAIN_TOSolution

Define `id` as a non-input private attribute (hidden from validation/schema) and generate it server-side using `PrivateAttr` (with `default_factory` for dynamic defaults). Keep `name` as the only public validated input field; the endpoint can still accept the original model type for consistent validation of `name`.

PERTAIN_TOProblem

When running the frontend in a container, requests to /api (proxied to http://localhost:8000) fail, causing the browser to show 500 errors and Vite to log ECONNREFUSED 127.0.0.1:8000.

PERTAIN_TOSolution

Update the Vite proxy target to use the backend container hostname (e.g., target: "http://backend:8000" instead of 127.0.0.1:8000) so the proxy routes traffic through Docker networking.

PERTAIN_TOProblem

Running a FastAPI app under IIS using Hypercorn fails with PermissionError [WinError 10013] when binding/creating the socket. The same Hypercorn command works when run directly from the command line outside IIS.

PERTAIN_TOProblem

only one type of account can be logged in in swagger ui. Tension: there's an api where the 'user' account is accessible, and there's an api where the 'shop' account is accessible. Outcome: Is there a way to use both types of accounts in Swagger ui?

PERTAIN_TOSolution

You can use this code to achive this. Tension: only one type of account can be logged in in swagger ui. Outcome: class ShopOAuth2PasswordBearer(OAuth2PasswordBearer): pass class UserOAuth2PasswordBearer(OAuth2PasswordBearer): pass.

PERTAIN_TOProblem

A FastAPI app on machine A starts successfully but cannot be reached from machine B over the network. Connections fail despite the server running without errors.

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