* Fix path and query parameters receiving `dict` as a valid type. It should be mapped to a body payload. PR [#287](https://github.com/tiangolo/fastapi/pull/287). Updated docs at: [Query parameter list / multiple values with defaults: Using `list`](https://fastapi.tiangolo.com/tutorial/query-params-str-validations/#using-list).
* Fix `auto_error=False` handling in `HTTPBearer` security scheme. Do not `raise` when there's an incorrect `Authorization` header if `auto_error=False`. PR [#282](https://github.com/tiangolo/fastapi/pull/282).
* Fix broken link in docs about OAuth 2.0 with scopes. PR [#275](https://github.com/tiangolo/fastapi/pull/275) by [@dmontagu](https://github.com/dmontagu).
* Refactor param extraction using Pydantic `Field`:
* Large refactor, improvement, and simplification of param extraction from *path operations*.
* Fix/add support for list *query parameters* with list defaults. New documentation: [Query parameter list / multiple values with defaults](https://fastapi.tiangolo.com/tutorial/query-params-str-validations/#query-parameter-list-multiple-values-with-defaults).
* Add support for enumerations in *path operation* parameters. New documentation: [Path Parameters: Predefined values](https://fastapi.tiangolo.com/tutorial/path-params/#predefined-values).
* Add support for type annotations using `Optional` as in `param: Optional[str] = None`. New documentation: [Optional type declarations](https://fastapi.tiangolo.com/tutorial/query-params/#optional-type-declarations).
* This will allow developers to customize the exception handlers.
* Document better how to handle exceptions and use error handlers.
* Include `RequestValidationError` and `WebSocketRequestValidationError` (this last one will be useful once [encode/starlette#527](https://github.com/encode/starlette/pull/527) or equivalent is merged).
* Update docs for testing FastAPI. Include using `POST`, sending JSON, testing headers, etc. New documentation: [Testing](https://fastapi.tiangolo.com/tutorial/testing/#testing-extended-example). PR [#271](https://github.com/tiangolo/fastapi/pull/271).
* Fix type declaration of `response_model` to allow generic Python types as `List[Model]`. Mainly to fix `mypy` for users. PR [#266](https://github.com/tiangolo/fastapi/pull/266).
* Add `CONTRIBUTING.md` file to GitHub, to help new contributors. PR [#255](https://github.com/tiangolo/fastapi/pull/255) by [@wshayes](https://github.com/wshayes).
* There's a new *path operation decorator* parameter `response_model_skip_defaults`.
* The name of the parameter will most probably change in a future version to `response_skip_defaults`, `model_skip_defaults` or something similar.
* New [documentation section about using `response_model_skip_defaults`](https://fastapi.tiangolo.com/tutorial/response-model/#response-model-encoding-parameters).
* PR [#248](https://github.com/tiangolo/fastapi/pull/248) by [@wshayes](https://github.com/wshayes).
* Upgrade the compatible version of Starlette to `0.12.0`.
* This includes support for ASGI 3 (the latest version of the standard).
* It's now possible to use [Starlette's `StreamingResponse`](https://www.starlette.io/responses/#streamingresponse) with iterators, like [file-like](https://docs.python.org/3/glossary.html#term-file-like-object) objects (as those returned by `open()`).
* It's now possible to use the low level utility `iterate_in_threadpool` from `starlette.concurrency` (for advanced scenarios).
* Add OAuth2 redirect page for Swagger UI. This allows having delegated authentication in the Swagger UI docs. For this to work, you need to add `{your_origin}/docs/oauth2-redirect` to the allowed callbacks in your OAuth2 provider (in Auth0, Facebook, Google, etc).
* For example, during development, it could be `http://localhost:8000/docs/oauth2-redirect`.
* Have in mind that this callback URL is independent of whichever one is used by your frontend. You might also have another callback at `https://yourdomain.com/login/callback`.
* This is only to allow delegated authentication in the API docs with Swagger UI.
* PR [#198](https://github.com/tiangolo/fastapi/pull/198) by [@steinitzu](https://github.com/steinitzu).
* Make Swagger UI and ReDoc route handlers (*path operations*) be `async` functions instead of lambdas to improve performance. PR [#241](https://github.com/tiangolo/fastapi/pull/241) by [@Trim21](https://github.com/Trim21).
* Make Swagger UI and ReDoc URLs parameterizable, allowing to host and serve local versions of them and have offline docs. PR [#112](https://github.com/tiangolo/fastapi/pull/112) by [@euri10](https://github.com/euri10).
* A parameter in *path operation decorators*, for dependencies that should be executed but the return value is not important or not used in the *path operation function*.
* A parameter in the `.include_router()` method of FastAPI applications and routers, to include dependencies that should be executed in each *path operation* in a router.
* This is useful, for example, to require authentication or permissions in specific group of *path operations*.
* Different `dependencies` can be applied to different routers.
* These `dependencies` are run before the normal parameter dependencies. And normal dependencies are run too. They can be combined.
* Dependencies declared in a router are executed first, then the ones defined in *path operation decorators*, and then the ones declared in normal parameters. They are all combined and executed.
* All this also supports using `Security` with `scopes` in those `dependencies` parameters, for more advanced OAuth 2.0 security scenarios with scopes.
* New documentation about [dependencies in *path operation decorators*](https://fastapi.tiangolo.com/tutorial/dependencies/dependencies-in-path-operation-decorators/).
* New documentation about [dependencies in the `include_router()` method](https://fastapi.tiangolo.com/tutorial/bigger-applications/#include-an-apirouter-with-a-prefix-tags-responses-and-dependencies).
* Fix OpenAPI documentation of Starlette URL convertors. Specially useful when using `path` convertors, to take a whole path as a parameter, like `/some/url/{p:path}`. PR [#234](https://github.com/tiangolo/fastapi/pull/234) by [@euri10](https://github.com/euri10).
* Make default parameter utilities exported from `fastapi` be functions instead of classes (the new functions return instances of those classes). To be able to override the return types and fix `mypy` errors in FastAPI's users' code. Applies to `Path`, `Query`, `Header`, `Cookie`, `Body`, `Form`, `File`, `Depends`, and `Security`. PR [#226](https://github.com/tiangolo/fastapi/pull/226) and PR [#231](https://github.com/tiangolo/fastapi/pull/231).
* On body parsing errors, raise `from` previous exception, to allow better introspection in logging code. PR [#192](https://github.com/tiangolo/fastapi/pull/195) by [@ricardomomm](https://github.com/ricardomomm).
* Use Python logger named "`fastapi`" instead of root logger. PR [#222](https://github.com/tiangolo/fastapi/pull/222) by [@euri10](https://github.com/euri10).
* Add typing information to package including file `py.typed`. PR [#209](https://github.com/tiangolo/fastapi/pull/209) by [@meadsteve](https://github.com/meadsteve).
* Include [Hypercorn](https://gitlab.com/pgjones/hypercorn) as an alternative ASGI server in the docs. PR [#187](https://github.com/tiangolo/fastapi/pull/187).
* Add docs for [Static Files](https://fastapi.tiangolo.com/tutorial/static-files/) and [Templates](https://fastapi.tiangolo.com/tutorial/templates/). PR [#186](https://github.com/tiangolo/fastapi/pull/186).
* By default, encode by alias. This allows using Pydantic `alias` parameters working by default. PR [#168](https://github.com/tiangolo/fastapi/pull/168).
* Upgrade _path operation_`doctsring` parsing to support proper Markdown descriptions. New documentation at [Path Operation Configuration](https://fastapi.tiangolo.com/tutorial/path-operation-configuration/#description-from-docstring). PR [#163](https://github.com/tiangolo/fastapi/pull/163).
* Fix typo in Tutorial about Extra Models. PR [#159](https://github.com/tiangolo/fastapi/pull/159) by [@danielmichaels](https://github.com/danielmichaels).
* Add support for multiple file uploads (as a single form field). New docs at: [Multiple file uploads](https://fastapi.tiangolo.com/tutorial/request-files/#multiple-file-uploads). PR [#158](https://github.com/tiangolo/fastapi/pull/158).
* Improve automatically generated names of path operations in OpenAPI (in API docs). A function `read_items` instead of having a generated name "Read Items Get" will have "Read Items". PR [#155](https://github.com/tiangolo/fastapi/pull/155).
* Update `/docs` Swagger UI to enable deep linking. This allows sharing the URL pointing directly to the path operation documentation in the docs. PR [#148](https://github.com/tiangolo/fastapi/pull/148) by [@wshayes](https://github.com/wshayes).
* Fix typos in section about nested models and OAuth2 with JWT. PR [#127](https://github.com/tiangolo/fastapi/pull/127) by [@mmcloud](https://github.com/mmcloud).
* The new documentation is here: [Additional Responses](https://fastapi.tiangolo.com/tutorial/additional-responses/).
*`responses` can also be added to `.include_router()`, the updated docs are here: [Bigger Applications](https://fastapi.tiangolo.com/tutorial/bigger-applications/#add-some-custom-tags-and-responses).
* PR [#97](https://github.com/tiangolo/fastapi/pull/97) originally initiated by [@barsi](https://github.com/barsi).
* Add `auto_error` parameter to security utility functions. Allowing them to be optional. Also allowing to have multiple alternative security schemes that are then checked in a single dependency instead of each one verifying and returning the error to the client automatically when not satisfied. PR [#134](https://github.com/tiangolo/fastapi/pull/134).
* Update [SQL Tutorial](https://fastapi.tiangolo.com/tutorial/sql-databases/#create-a-middleware-to-handle-sessions) to close database sessions even when there are exceptions. PR [#89](https://github.com/tiangolo/fastapi/pull/89) by [@alexiri](https://github.com/alexiri).
* Make Travis run Ubuntu Xenial (newer version) and Python 3.7 instead of Python 3.7-dev. PR [#92](https://github.com/tiangolo/fastapi/pull/92) by [@blueyed](https://github.com/blueyed).
* Add note in [Response Model docs](https://fastapi.tiangolo.com/tutorial/response-model/) about why using a function parameter instead of a function return type annotation. PR [#109](https://github.com/tiangolo/fastapi/pull/109) by [@JHSaunders](https://github.com/JHSaunders).
* Add support for Background Tasks in _path operation functions_ and dependencies. New documentation about [Background Tasks is here](https://fastapi.tiangolo.com/tutorial/background-tasks/). PR [#103](https://github.com/tiangolo/fastapi/pull/103).
* Add support for `.websocket_route()` in `APIRouter`. PR [#100](https://github.com/tiangolo/fastapi/pull/100) by [@euri10](https://github.com/euri10).
* Document receiving [Multiple values with the same query parameter](https://fastapi.tiangolo.com/tutorial/query-params-str-validations/#query-parameter-list-multiple-values) and [Duplicate headers](https://fastapi.tiangolo.com/tutorial/header-params/#duplicate-headers). PR [#95](https://github.com/tiangolo/fastapi/pull/95).
* Add support for adding `tags` in `app.include_router()`. PR [#55](https://github.com/tiangolo/fastapi/pull/55) by [@euri10](https://github.com/euri10). Documentation updated in the section: [Bigger Applications](https://fastapi.tiangolo.com/tutorial/bigger-applications/).
* Update [technical details about `async def` handling](https://fastapi.tiangolo.com/async/#path-operation-functions) with respect to previous frameworks. PR [#64](https://github.com/tiangolo/fastapi/pull/64) by [@haizaar](https://github.com/haizaar).
* Add [deployment documentation for Docker in Raspberry Pi](https://fastapi.tiangolo.com/deployment/#raspberry-pi-and-other-architectures) and other architectures.
* Here's the updated documentation for declaring [`File` parameters with `UploadFile`](https://fastapi.tiangolo.com/tutorial/request-files/#file-parameters-with-uploadfile).
* And here's the updated documentation for using [`Form` parameters mixed with `File` parameters, supporting `bytes` and `UploadFile`](https://fastapi.tiangolo.com/tutorial/request-forms-and-files/) at the same time.
* Add docs for using [WebSockets with **FastAPI**](https://fastapi.tiangolo.com/tutorial/websockets/). PR [#62](https://github.com/tiangolo/fastapi/pull/62).
* Introduce new project generator based on FastAPI and PostgreSQL: [https://github.com/tiangolo/full-stack-fastapi-postgresql](https://github.com/tiangolo/full-stack-fastapi-postgresql). PR [#52](https://github.com/tiangolo/fastapi/pull/52).
* Update [SQL tutorial with SQLAlchemy, using `Depends` to improve editor support and reduce code repetition](https://fastapi.tiangolo.com/tutorial/sql-databases/). PR [#52](https://github.com/tiangolo/fastapi/pull/52).
* Improve middleware naming in tutorial for SQL with SQLAlchemy [https://fastapi.tiangolo.com/tutorial/sql-databases/](https://fastapi.tiangolo.com/tutorial/sql-databases/).
* Update SQL with SQLAlchemy tutorial at [https://fastapi.tiangolo.com/tutorial/sql-databases/](https://fastapi.tiangolo.com/tutorial/sql-databases/) using the new official `request.state`. PR [#45](https://github.com/tiangolo/fastapi/pull/45).
* Update [section about error handling](https://fastapi.tiangolo.com/tutorial/handling-errors/) with more information and make relation with Starlette error handling utilities more explicit. PR [#41](https://github.com/tiangolo/fastapi/pull/41).
* Add new `HTTPException` with support for custom headers. With new documentation for handling errors at: [https://fastapi.tiangolo.com/tutorial/handling-errors/](https://fastapi.tiangolo.com/tutorial/handling-errors/). PR [#35](https://github.com/tiangolo/fastapi/pull/35).
* Add [documentation to use Starlette `Request` object](https://fastapi.tiangolo.com/tutorial/using-request-directly/) directly. Check [#25](https://github.com/tiangolo/fastapi/pull/25) by [@euri10](https://github.com/euri10).
* Update example for the SQLAlchemy tutorial at [https://fastapi.tiangolo.com/tutorial/sql-databases/](https://fastapi.tiangolo.com/tutorial/sql-databases/) using middleware and database session attached to request.
* Add `openapi_prefix`, support for reverse proxy and mounting sub-applications. See the docs at [https://fastapi.tiangolo.com/tutorial/sub-applications-proxy/](https://fastapi.tiangolo.com/tutorial/sub-applications-proxy/): [#26](https://github.com/tiangolo/fastapi/pull/26) by [@kabirkhan](https://github.com/kabirkhan).
* Fix/add SQLAlchemy support, including ORM, and update [docs for SQLAlchemy](https://fastapi.tiangolo.com/tutorial/sql-databases/): [#30](https://github.com/tiangolo/fastapi/pull/30).
* Upgrade Starlette version to the current latest `0.10.1`: [#17](https://github.com/tiangolo/fastapi/pull/17) by [@euri10](https://github.com/euri10).
