static final int DEFAULT_SO_TIMEOUT = 5000;
    static final int DEFAULT_RCV_BUF_SIZE = 576;
    static final int DEFAULT_SND_BUF_SIZE = 576;
    static final int NAME_SERVICE_UDP_PORT = 137;
    static final int DEFAULT_RETRY_COUNT = 2;
    static final int DEFAULT_RETRY_TIMEOUT = 3000;

    static final int RESOLVER_LMHOSTS = 1;
    static final int RESOLVER_BCAST = 2;
    static final int RESOLVER_WINS = 3;

 *  Upgrade: [Bouncy Castle 1.65][bouncy_castle_releases]. This dependency is required by the
    `okhttp-tls` module.

 *  Upgrade: [Kotlin 1.3.71][kotlin_1_3_71].


## Version 4.5.0

_2020-04-06_

**This release fixes a severe bug where OkHttp incorrectly detected and recovered from unhealthy

### 导入 `FastAPI`

你可以像平常一样导入并创建一个 `FastAPI` 类。

我们甚至可以声明[全局依赖项](dependencies/global-dependencies.md){.internal-link target=_blank}，它会和每个 `APIRouter` 的依赖项组合在一起：

```Python hl_lines="1  3  7" title="app/main.py"
{!../../docs_src/bigger_applications/app/main.py!}
```

### 导入 `APIRouter`

现在，我们导入具有 `APIRouter` 的其他子模块：

```Python hl_lines="5" title="app/main.py"

e"}.fa-blackberry:before{content:"\f37b"}.fa-blender:before{content:"\f517"}.fa-blender-phone:before{content:"\f6b6"}.fa-blind:before{content:"\f29d"}.fa-blog:before{content:"\f781"}.fa-blogger:before{content:"\f37c"}.fa-blogger-b:before{content:"\f37d"}.fa-bluetooth:before{content:"\f293"}.fa-bluetooth-b:before{content:"\f294"}.fa-bold:before{content:"\f032"}.fa-bolt:before{content:"\f0e7"}.fa-bomb:before{content:"\f1e2"}.fa-bone:before{content:"\f5d7"}.fa-bong:before{content:"\f55c"}.fa-book:b...

* 🌐 Initialize new language Korean for translations. PR [#2018](https://github.com/tiangolo/fastapi/pull/2018) by [@hard-coders](https://github.com/hard-coders).
* 🌐 Add Portuguese translation of Deployment. PR [#1374](https://github.com/tiangolo/fastapi/pull/1374) by [@Serrones](https://github.com/Serrones).

### Internal

- You can now use `kubeadm init --experimental-upload-certs` and `kubeadm join --experimental-control-plane --certificate-key`.
kubernetes/kubeadm: [#1373](https://github.com/kubernetes/kubeadm/issues/1373)