// header fields
		if r.Method == http.MethodPut && r.Header.Get(xhttp.AmzCopySource) != "" {
			bucket, object = path2BucketObject(r.Header.Get(xhttp.AmzCopySource))
			if bucket == "" || object == "" {
				h.ServeHTTP(w, r)
				return
			}
		}
		sr, err := globalDNSConfig.Get(bucket)
		if err != nil {
			defer logger.AuditLog(r.Context(), w, r, mustGetClaimsFromToken(r))

* Kiểm tra xem có một `item_id` trong đường dẫn với các request `GET` và `PUT` không?
* Kiểm tra xem `item_id` có phải là kiểu `int` trong các request `GET` và `PUT` không?
    * Nếu không, client sẽ thấy một lỗi rõ ràng và hữu ích.
* Kiểm tra xem nếu có một tham số `q` trong query string (ví dụ như `http://127.0.0.1:8000/items/foo?q=somequery`) cho request `GET`.
    * Tham số `q` được định nghĩa `= None`, nó là tùy chọn.

    * 数据库模型
    * ......以及更多其他类型
* 自动生成的交互式 API 文档，包括两种可选的用户界面：
    * Swagger UI
    * ReDoc

---

回到前面的代码示例，**FastAPI** 将会：

* 校验 `GET` 和 `PUT` 请求的路径中是否含有 `item_id`。
* 校验 `GET` 和 `PUT` 请求中的 `item_id` 是否为 `int` 类型。
    * 如果不是，客户端将会收到清晰有用的错误信息。
* 检查 `GET` 请求中是否有命名为 `q` 的可选查询参数（比如 `http://127.0.0.1:8000/items/foo?q=somequery`）。
    * 因为 `q` 被声明为 `= None`，所以它是可选的。
    * 如果没有 `None` 它将会是必需的 (如 `PUT` 例子中的请求体)。

		if err != nil {
			return UserIdentity{}, nil, err
		}
	}

	return tmpAcc, embeddedPolicy, nil
}

// getAccountWithClaims - gets information about an account with claims
func (sys *IAMSys) getAccountWithClaims(ctx context.Context, accessKey string) (UserIdentity, *jwt.MapClaims, error) {
	if !sys.Initialized() {

        ModelSource result = resolveModel(parent.getDelegate(), resolvedParent);
        if (resolvedParent.get() != null) {
            parent.setVersion(resolvedParent.get().getVersion());
        }
        return result;
    }

    @Override

    public boolean containsValue(Object value) {
      assertTrue(Thread.holdsLock(mutex));
      return super.containsValue(value);
    }

    @Override
    public @Nullable V get(Object key) {
      assertTrue(Thread.holdsLock(mutex));
      return super.get(key);
    }

    @Override
    public @Nullable V put(K key, V value) {
      assertTrue(Thread.holdsLock(mutex));
      return super.put(key, value);
    }

    Predicate<Throwable> predicate = INSTANCE_OF.get(expectedThrowable);
    if (predicate == null) {
      throw new IllegalArgumentException(
          expectedThrowable
              + " is not yet supported by ReflectionFreeAssertThrows. Add an entry for it in the"
              + " map in that class.");
    }
    Object result;
    try {
      result = supplier.get();
    } catch (Throwable t) {

    return backingMap;
  }

  @SuppressWarnings("unchecked") // value could not get in if not a T
  @CheckForNull
  private <T extends B> T trustedPut(TypeToken<@NonNull T> type, @ParametricNullness T value) {
    return (T) backingMap.put(type, value);
  }

  @SuppressWarnings("unchecked") // value could not get in if not a T
  @CheckForNull
  private <T extends @NonNull B> T trustedGet(TypeToken<T> type) {

		Description:    "The web identity token that was passed is expired or is not valid. Get a new identity token from the identity provider and then retry the request.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrSTSClientGrantsExpiredToken: {
		Code:           "ExpiredToken",
		Description:    "The client grants that was passed is expired or is not valid. Get a new client grants token from the identity provider and then retry the request.",

def invoice_notification(body: InvoiceEvent):
    pass  # pragma: nocover


class Event(BaseModel):
    name: str
    total: float


events_callback_router = APIRouter()


@events_callback_router.get("{$callback_url}/events/{$request.body.title}")
def event_callback(event: Event):
    pass  # pragma: nocover


subrouter = APIRouter()


@subrouter.post("/invoices/", callbacks=invoices_callback_router.routes)