azMeta[k] = to.Ptr(v)
	}
	resp, err := az.clnt.UploadStream(ctx, az.Bucket, az.getDest(object), io.LimitReader(r, length), &azblob.UploadStreamOptions{
		Concurrency: 4,
		AccessTier:  az.tier(), // set tier if specified
		Metadata:    azMeta,
	})
	if err != nil {
		return "", azureToObjectError(err, az.Bucket, az.getDest(object))
	}
	vid := ""
	if resp.VersionID != nil {
		vid = *resp.VersionID
	}
	return remoteVersionID(vid), nil

                }
            }
            return maxBandwidthChannel != null ? maxBandwidthChannel : channels.iterator().next();
        }

        if (isMetadataOperation(message)) {
            // For metadata operations, prefer low-latency channels
            return selectLeastLoaded(channels);
        }

        // Default to weighted random for general operations
        return selectWeightedRandom(channels);
    }

標準の型アノテーションを使い、デフォルト値を `None` に設定することで、ファイルを任意にできます:

{* ../../docs_src/request_files/tutorial001_02_an_py310.py hl[9,17] *}

## 追加メタデータつきの `UploadFile` { #uploadfile-with-additional-metadata }

例えば追加のメタデータを設定するために、`UploadFile` と併せて `File()` を使うこともできます:

{* ../../docs_src/request_files/tutorial001_03_an_py310.py hl[9,15] *}

## 複数ファイルのアップロード { #multiple-file-uploads }

同時に複数のファイルをアップロードできます。

FastAPI 在 0.95.0 版加入並開始推薦使用 `Annotated`。

如果你使用更舊的版本，嘗試使用 `Annotated` 會出錯。

請確保在使用 `Annotated` 前，先[升級 FastAPI 版本](../deployment/versions.md#upgrading-the-fastapi-versions)到至少 0.95.1。

///

## 宣告中繼資料 { #declare-metadata }

你可以宣告與 `Query` 相同的所有參數。

例如，若要為路徑參數 `item_id` 宣告 `title` 中繼資料，可以這樣寫：

{* ../../docs_src/path_params_numeric_validations/tutorial001_an_py310.py hl[10] *}

/// note

import org.opensearch.search.sort.SortBuilder;

/**
 * Context object that holds query-related information and state during search processing.
 * Contains the query string, query builder, sort criteria, and various metadata.
 */
public class QueryContext {

    /** Prefix for queries that search only in URL fields. */
    protected static final String ALLINURL_FIELD_PREFIX = "allinurl:";

    }

    /**
     * Upload character mapping file for the specified dictionary.
     *
     * @param dictId identifier of the dictionary to upload mapping for
     * @param form upload form containing the file and metadata
     * @return JSON response indicating the API result status
     */
    // PUT /api/admin/dict/mapping/upload/{dictId}
    @Execute

import jcifs.internal.smb2.create.CreateContextRequest;
import jcifs.internal.util.SMBUtil;

/**
 * Directory Lease Context for SMB3 directory leasing
 *
 * This context extends standard lease context with directory-specific metadata
 * for enhanced directory caching capabilities.
 */
public class DirectoryLeaseContext implements CreateContextRequest {

    /**
     * Context name for directory lease request
     */

///

## 在 `q` 參數的型別中使用 `Annotated` { #use-annotated-in-the-type-for-the-q-parameter }

還記得先前在 [Python 型別介紹](../python-types.md#type-hints-with-metadata-annotations) 提到可以用 `Annotated` 為參數加入中繼資料嗎？

現在就用在 FastAPI 上吧。🚀

我們原本的型別註記是：

```Python
q: str | None = None
```

接著把它用 `Annotated` 包起來，變成：

```Python
q: Annotated[str | None] = None
```

		// Bucket migration operations
		// ExportBucketMetaHandler
		adminRouter.Methods(http.MethodGet).Path(adminVersion + "/export-bucket-metadata").HandlerFunc(
			adminMiddleware(adminAPI.ExportBucketMetadataHandler))
		// ImportBucketMetaHandler
		adminRouter.Methods(http.MethodPut).Path(adminVersion + "/import-bucket-metadata").HandlerFunc(
			adminMiddleware(adminAPI.ImportBucketMetadataHandler))

		// Remote Tier management operations

	object := gcs.client.Bucket(gcs.Bucket).Object(gcs.getDest(key))
	w := object.NewWriter(ctx)
	if gcs.StorageClass != "" {
		w.StorageClass = gcs.StorageClass
	}
	w.Metadata = meta
	if _, err := xioutil.Copy(w, data); err != nil {
		return "", gcsToObjectError(err, gcs.Bucket, key)
	}

	if _, err := xioutil.Copy(w, data); err != nil {
		return "", gcsToObjectError(err, gcs.Bucket, key)