* {@code A -> B}.
   *
   * @since 9.0 (in 1.0 as {@code com.google.common.base.Service.State})
   */
  enum State {
    /** A service in this state is inactive. It does minimal work and consumes minimal resources. */
    NEW,

    /** A service in this state is transitioning to {@link #RUNNING}. */
    STARTING,

    /** A service in this state is operational. */

        //      <nonProxyHosts>www.google.com|*.somewhere.com</nonProxyHosts>
        //    </proxy>
        //  </proxies>

        for (Proxy proxy : settings.getProxies()) {
            if (!proxy.isActive()) {
                continue;
            }

            request.addProxy(proxy);
        }

        // <mirrors>
        //   <mirror>
        //     <id>nexus</id>

    }

    public int getDepth() {
        return depth;
    }

    public List<ArtifactRepository> getRemoteRepositories() {
        return remoteRepositories;
    }

    public boolean isActive() {
        return active;
    }

    public void enable() {
        active = true;

        // TODO if it was null, we really need to go find them now... or is this taken care of by the ordering?

        //      <nonProxyHosts>www.google.com|*.somewhere.com</nonProxyHosts>
        //    </proxy>
        //  </proxies>

        for (Proxy proxy : settings.getProxies()) {
            if (!proxy.isActive()) {
                continue;
            }

            proxy = proxy.clone();

            request.addProxy(proxy);
        }

        // <mirrors>
        //   <mirror>

    }

    @Override
    public boolean isLoading() {
      return true;
    }

    @Override
    public boolean isActive() {
      return oldValue.isActive();
    }

    @Override
    public int getWeight() {
      return oldValue.getWeight();
    }

    @CanIgnoreReturnValue
    public boolean set(@Nullable V newValue) {

No entanto, pode haver casos em que escrevemos algum código que **trava todo o aplicativo**, fazendo com que o Uvicorn e o Python travem. 💥

E ainda assim, você provavelmente não gostaria que o aplicativo permanecesse inativo porque houve um erro em um lugar, você provavelmente quer que ele **continue em execução** pelo menos para as *operações de caminho* que não estão quebradas.

### Reiniciar após falha { #restart-after-crash }

	return nil
}

func (target ExampleTarget) Close() error {
	if target.closeErr {
		return errors.New("close error")
	}

	return nil
}

func (target ExampleTarget) IsActive() (bool, error) {
	return false, errors.New("not connected to target server/service")
}

// FlushQueueStore - No-Op. Added for interface compatibility
func (target ExampleTarget) FlushQueueStore() error {
	return nil

}
```

### 未激活用户

测试未激活用户，输入以下信息，进行身份验证：

用户名：`alice`

密码：`secret2`

然后，执行 `/users/me` 路径的 `GET` 操作。

显示下列**未激活用户**错误信息：

```JSON
{
  "detail": "Inactive user"
}
```

## 小结

使用本章的工具实现基于 `username` 和 `password` 的完整 API 安全系统。

这些工具让安全系统兼容任何数据库、用户及数据模型。

唯一欠缺的是，它仍然不是真的**安全**。

   * {@code A -> B}.
   *
   * @since 9.0 (in 1.0 as {@code com.google.common.base.Service.State})
   */
  enum State {
    /** A service in this state is inactive. It does minimal work and consumes minimal resources. */
    NEW,

    /** A service in this state is transitioning to {@link #RUNNING}. */
    STARTING,

    /** A service in this state is operational. */

     *            context to use
     * @return whether this address is active
     *
     * @throws UnknownHostException
     *             if the host cannot be resolved to find out.
     */
    boolean isActive(CIFSContext tc) throws UnknownHostException;

    /**
     * Determines if this address is set to be permanent.
     *
     * @param tc
     *            context to use