sanic/docs/sanic/releases/21/21.12.md

## Version 21.12.1

- [#2349](https://github.com/sanic-org/sanic/pull/2349) Only display MOTD on startup
- [#2354](https://github.com/sanic-org/sanic/pull/2354) Ignore name argument in Python 3.7
- [#2355](https://github.com/sanic-org/sanic/pull/2355) Add config.update support for all config values

## Version 21.12.0

### Features
- [#2260](https://github.com/sanic-org/sanic/pull/2260) Allow early Blueprint registrations to still apply later added objects
- [#2262](https://github.com/sanic-org/sanic/pull/2262) Noisy exceptions - force logging of all exceptions
- [#2264](https://github.com/sanic-org/sanic/pull/2264) Optional `uvloop` by configuration
- [#2270](https://github.com/sanic-org/sanic/pull/2270) Vhost support using multiple TLS certificates
- [#2277](https://github.com/sanic-org/sanic/pull/2277) Change signal routing for increased consistency
    - *BREAKING CHANGE*: If you were manually routing signals there is a breaking change. The signal router's `get` is no longer 100% determinative. There is now an additional step to loop thru the returned signals for proper matching on the requirements. If signals are being dispatched using `app.dispatch` or `bp.dispatch`, there is no change.
- [#2290](https://github.com/sanic-org/sanic/pull/2290) Add contextual exceptions
- [#2291](https://github.com/sanic-org/sanic/pull/2291) Increase join concat performance 
- [#2295](https://github.com/sanic-org/sanic/pull/2295), [#2316](https://github.com/sanic-org/sanic/pull/2316), [#2331](https://github.com/sanic-org/sanic/pull/2331) Restructure of CLI and application state with new displays and more command parity with `app.run`
- [#2302](https://github.com/sanic-org/sanic/pull/2302) Add route context at definition time
- [#2304](https://github.com/sanic-org/sanic/pull/2304) Named tasks and new API for managing background tasks
- [#2307](https://github.com/sanic-org/sanic/pull/2307) On app auto-reload, provide insight of changed files
- [#2308](https://github.com/sanic-org/sanic/pull/2308) Auto extend application with [Sanic Extensions](https://sanicframework.org/en/plugins/sanic-ext/getting-started.html) if it is installed, and provide first class support for accessing the extensions
- [#2309](https://github.com/sanic-org/sanic/pull/2309) Builtin signals changed to `Enum`
- [#2313](https://github.com/sanic-org/sanic/pull/2313) Support additional config implementation use case
- [#2321](https://github.com/sanic-org/sanic/pull/2321) Refactor environment variable hydration logic
- [#2327](https://github.com/sanic-org/sanic/pull/2327) Prevent sending multiple or mixed responses on a single request
- [#2330](https://github.com/sanic-org/sanic/pull/2330) Custom type casting on environment variables
- [#2332](https://github.com/sanic-org/sanic/pull/2332) Make all deprecation notices consistent
- [#2335](https://github.com/sanic-org/sanic/pull/2335) Allow underscore to start instance names

### Bugfixes
- [#2273](https://github.com/sanic-org/sanic/pull/2273) Replace assignation by typing for `websocket_handshake`
- [#2285](https://github.com/sanic-org/sanic/pull/2285) Fix IPv6 display in startup logs
- [#2299](https://github.com/sanic-org/sanic/pull/2299) Dispatch `http.lifecyle.response` from exception handler

### Deprecations and Removals
- [#2306](https://github.com/sanic-org/sanic/pull/2306) Removal of deprecated items
    - `Sanic` and `Blueprint` may no longer have arbitrary properties attached to them
    - `Sanic` and `Blueprint` forced to have compliant names
        - alphanumeric + `_` + `-`
        - must start with letter or `_`
    - `load_env` keyword argument of `Sanic`
    - `sanic.exceptions.abort`
    - `sanic.views.CompositionView`
    - `sanic.response.StreamingHTTPResponse`
        - *NOTE:* the `stream()` response method (where you pass a callable streaming function) has been deprecated and will be removed in v22.6. You should upgrade all streaming responses to the new style: https://sanicframework.org/en/guide/advanced/streaming.html#response-streaming
- [#2320](https://github.com/sanic-org/sanic/pull/2320) Remove app instance from Config for error handler setting

### Developer infrastructure
- [#2251](https://github.com/sanic-org/sanic/pull/2251) Change dev install command
- [#2286](https://github.com/sanic-org/sanic/pull/2286) Change codeclimate complexity threshold from 5 to 10
- [#2287](https://github.com/sanic-org/sanic/pull/2287) Update host test function names so they are not overwritten
- [#2292](https://github.com/sanic-org/sanic/pull/2292) Fail CI on error
- [#2311](https://github.com/sanic-org/sanic/pull/2311), [#2324](https://github.com/sanic-org/sanic/pull/2324) Do not run tests for draft PRs
- [#2336](https://github.com/sanic-org/sanic/pull/2336) Remove paths from coverage checks
- [#2338](https://github.com/sanic-org/sanic/pull/2338) Cleanup ports on tests

### Improved Documentation
- [#2269](https://github.com/sanic-org/sanic/pull/2269), [#2329](https://github.com/sanic-org/sanic/pull/2329), [#2333](https://github.com/sanic-org/sanic/pull/2333) Cleanup typos and fix language

### Miscellaneous
- [#2257](https://github.com/sanic-org/sanic/pull/2257), [#2294](https://github.com/sanic-org/sanic/pull/2294), [#2341](https://github.com/sanic-org/sanic/pull/2341) Add Python 3.10 support
- [#2279](https://github.com/sanic-org/sanic/pull/2279), [#2317](https://github.com/sanic-org/sanic/pull/2317), [#2322](https://github.com/sanic-org/sanic/pull/2322) Add/correct missing type annotations
- [#2305](https://github.com/sanic-org/sanic/pull/2305) Fix examples to use modern implementations