ASN1TaggedObject mechToken = ASN1Util.as(ASN1TaggedObject.class, stream.readObject());
            if ( mechToken == null || mechToken.getTagClass() != BERTags.APPLICATION ||
                    !(mechToken.getBaseObject() instanceof ASN1Sequence) )
                throw new PACDecodingException("Malformed kerberos token");

## `shutdown` 事件

使用 `shutdown` 事件声明 `app` 关闭时运行的函数：

```Python hl_lines="6"
{!../../docs_src/events/tutorial002.py!}
```

此处，`shutdown` 事件处理器函数在 `log.txt` 中写入一行文本 `Application shutdown`。

/// info | "说明"

`open()` 函数中，`mode="a"` 指的是**追加**。因此这行文本会添加在文件已有内容之后，不会覆盖之前的内容。

///

/// tip | "提示"

注意，本例使用 Python `open()` 标准函数与文件交互。

这个函数执行 I/O（输入/输出）操作，需要等待内容写进磁盘。

                "get": {
                    "responses": {
                        "200": {
                            "description": "Successful Response",
                            "content": {"application/json": {"schema": {}}},
                        }
                    },
                    "summary": "Read Current User",
                    "operationId": "read_current_user_users_me_get",

<span style="color: green;">INFO</span>:     Started server process [28722]
<span style="color: green;">INFO</span>:     Waiting for application startup.
<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

/// note | "Hinweis"

Der Befehl `uvicorn main:app` bezieht sich auf:

* `main`: die Datei `main.py` (das sogenannte Python-„Modul“).

✋️ 👆 💪 📣 `Response` 👈 👆 💚 ⚙️, *➡ 🛠️ 👨‍🎨*.

🎚 👈 👆 📨 ⚪️➡️ 👆 *➡ 🛠️ 🔢* 🔜 🚮 🔘 👈 `Response`.

& 🚥 👈 `Response` ✔️ 🎻 📻 🆎 (`application/json`), 💖 💼 ⏮️ `JSONResponse` & `UJSONResponse`, 💽 👆 📨 🔜 🔁 🗜 (& ⛽) ⏮️ 🙆 Pydantic `response_model` 👈 👆 📣 *➡ 🛠️ 👨‍🎨*.

/// note

Kubelet supports 100 pods per node with 4x reduced system overhead.
  * <strong>Simplified application deployment and management. </strong>
     * Dynamic Configuration (ConfigMap API in the core API group) enables application
configuration to be stored as a Kubernetes API object and pulled dynamically on
container startup, as an alternative to baking in command-line flags when a

        def fetch_credentials():
            # HTTP headers are case insensitive filter out
            # all duplicate headers and pick one.
            headers = {}
            headers['content-type'] = 'application/x-www-form-urlencoded'
            headers['authorization'] = urllib3.make_headers(
                basic_auth='%s:%s' % (self.cid, self.csec))['authorization']

            response = self._http.urlopen('POST', self.idp_ep,

                        Curl.post(url).header("Authorization", "Bearer " + user.getAuthenticationResult().getAccessToken())
                                .header("Accept", "application/json").header("Content-type", "application/json")
                                .body("{\"securityEnabledOnly\":false}").execute()) {
                    final Map<String, Object> contentMap = response.getContent(OpenSearchCurl.jsonParser());

Você pode declarar vários parâmetros `File` e `Form` em uma *operação de caminho*, mas não é possível declarar campos `Body` para receber como JSON, pois a requisição terá o corpo codificado usando `multipart/form-data` ao invés de `application/json`.

Isso não é uma limitação do **FastAPI** , é parte do protocolo HTTP.

///

## Recapitulando

                "get": {
                    "responses": {
                        "200": {
                            "description": "Successful Response",
                            "content": {"application/json": {"schema": {}}},
                        }
                    },
                    "summary": "Read Current User",
                    "operationId": "read_current_user_users_me_get",