logKind = ek
		}
	}

	req := GetReqInfo(ctx)
	if req == nil {
		req = &ReqInfo{
			API:       "SYSTEM",
			RequestID: fmt.Sprintf("%X", time.Now().UTC().UnixNano()),
		}
	}
	req.RLock()
	defer req.RUnlock()

	API := "SYSTEM"
	switch {
	case req.API != "":
		API = req.API
	case subsystem != "":
		API += "." + subsystem
	}

from typing import Union

from pydantic.v1 import BaseModel


class Item(BaseModel):
    name: str
    description: Union[str, None] = None

在介绍依赖项与安全的章节中，您可以了解更多用 `raise` 异常代替 `return` 值的优势。

本例中，客户端用 `ID` 请求的 `item` 不存在时，触发状态码为 `404` 的异常：

{* ../../docs_src/handling_errors/tutorial001.py hl[11] *}

### 响应结果

请求为 `http://example.com/items/foo`（`item_id` 为 `「foo」`）时，客户端会接收到 HTTP 状态码 - 200 及如下 JSON 响应结果：

```JSON
{
  "item": "The Foo Wrestlers"
}

```

	if err != nil {
		return meta, false, err
	}
	sys.Lock()
	sys.metadataMap[bucket] = meta
	sys.Unlock()

	return meta, true, nil
}

// Init - initializes bucket metadata system for all buckets.
func (sys *BucketMetadataSys) Init(ctx context.Context, buckets []string, objAPI ObjectLayer) error {
	if objAPI == nil {
		return errServerNotInitialized
	}

	sys.objAPI = objAPI

                    "message": {
                        "title": "Message",
                        "type": "string"
                    }
                }
            },
            "Item": {
                "title": "Item",
                "required": [
                    "id",
                    "value"
                ],
                "type": "object",
                "properties": {

                final StorageItem item = new StorageItem(name, prefix, isDirectory, isDirectory ? 0 : blob.getSize(),
                        isDirectory ? null : lastModified, encodeId(blobName));

                if (isDirectory) {
                    items.add(item);
                } else {
                    fileItems.add(item);
                }

	for len(r.current) <= r.recordsRead {
		if r.err != nil {
			return nil, r.err
		}
		// Move to next block
		item, ok := <-r.queue
		if !ok {
			r.err = io.EOF
			return nil, r.err
		}

		r.csvDstPool.Put(r.current)
		r.current = <-item.dst
		r.err = item.err
		r.recordsRead = 0
	}
	csvRecord := r.current[r.recordsRead]
	r.recordsRead++

	// If no column names are set, use _(index)

 *
 *
 * The resulting file is used by [PublicSuffixDatabase].
 */
class PublicSuffixListGenerator(
  projectRoot: Path = ".".toPath(),
  val fileSystem: FileSystem = FileSystem.SYSTEM,
  val client: OkHttpClient = OkHttpClient(),
) {
  private val testResources = projectRoot / "okhttp/src/jvmTest/resources"

        // only show msg if a change is actually taking place
        if (!replacement.getScope().equals(artifact.getScope())) {
            String msg = indent + artifact + " (applying system path: " + replacement.getFile() + ")";
            logger.debug(msg);
        }
    }

   * - https://github.com/jspecify/jspecify/issues/65
   *
   * - https://github.com/jspecify/jdk/commit/71d826792b8c7ef95d492c50a274deab938f2552
   */
  /*
   * TODO(cpovirk): Is the unchecked cast avoidable? Would System.arraycopy be similarly fast (if
   * likewise not type-checked)? Could our single caller do something different?
   */
  @SuppressWarnings({"nullness", "unchecked"})