If it was in a type annotation we could have used the vertical bar, as:

```Python
some_variable: PlaneItem | CarItem
```

But if we put that in the assignment `response_model=PlaneItem | CarItem` we would get an error, because Python would try to perform an **invalid operation** between `PlaneItem` and `CarItem` instead of interpreting that as a type annotation.

    multimap.put(2, "foo");
    for (String element : elements) {
      multimap.put(3, element);
    }
  }

  static void populateMultimapForKeySet(Multimap<String, Integer> multimap, String[] elements) {
    for (String element : elements) {
      multimap.put(element, 2);
      multimap.put(element, 3);
    }
  }

  @Override
  public @Nullable V put(K key, V value) {
    checkNotNull(key);
    checkNotNull(value);
    int hash = hash(key);
    return segmentFor(hash).put(key, hash, value, false);
  }

  @Override
  public @Nullable V putIfAbsent(K key, V value) {
    checkNotNull(key);
    checkNotNull(value);
    int hash = hash(key);
    return segmentFor(hash).put(key, hash, value, true);
  }

 *
 * (We could consider releasing a listenablefuture:1.0.1 someday. But we would want to look into how
 * that affects users, especially users of the Android Gradle Plugin, since the plugin developers
 * put in a special hack for us: https://issuetracker.google.com/issues/131431257)
 */
@DoNotMock("Use the methods in Futures (like immediateFuture) or SettableFuture")
@NullMarked

	// uses *testing.B and the object Layer to run the benchmark.
	runPutObjectBenchmark(b, objLayer, objSize)
}

// creates Erasure/FS backend setup, obtains the object layer and runs parallel benchmark for put object.
func benchmarkPutObjectParallel(b *testing.B, instanceType string, objSize int) {
	// create a temp Erasure/FS backend.
	ctx, cancel := context.WithCancel(b.Context())
	defer cancel()

* 匯入 `CORSMiddleware`。
* 建立允許的來源清單（字串）。
* 將它加入到你的 **FastAPI** 應用程式做為「中介軟體（middleware）」。

你也可以指定你的後端是否允許：

* 憑證（credentials，例如 Authorization 標頭、Cookie 等）。
* 特定的 HTTP 方法（如 `POST`、`PUT`），或使用萬用字元 `"*"` 表示全部。
* 特定的 HTTP 標頭，或使用萬用字元 `"*"` 表示全部。

{* ../../docs_src/cors/tutorial001_py310.py hl[2,6:11,13:19] *}

`CORSMiddleware` 的實作在預設參數上相當嚴格，因此你需要明確啟用特定的來源、方法或標頭，瀏覽器才會允許在跨網域情境中使用它們。

支援以下參數：

				Name:         "obj-1",
			},
			hasRules: false,
		},
		{ // PUT version with no matching tags
			lc: Lifecycle{
				Rules: []Rule{
					rules[0],
				},
			},
			opts: ObjectOpts{
				IsLatest: true,
				Name:     "obj-1",
				Size:     1 * humanize.MiByte,
			},
			hasRules: false,
		},
		{ // PUT version with matching tags
			lc: Lifecycle{
				Rules: []Rule{

Keep in mind that you have to return the `JSONResponse` directly.

///

/// info

The `model` key is not part of OpenAPI.

**FastAPI** will take the Pydantic model from there, generate the JSON Schema, and put it in the correct place.

The correct place is:

* In the key `content`, that has as value another JSON object (`dict`) that contains:

        DocumentHelper documentHelper = new DocumentHelper();
        ResponseData responseData = new ResponseData();
        Map<String, Object> dataMap = new HashMap<>();

        responseData.getMetaDataMap().put(TikaExtractor.class.getSimpleName(), new TikaExtractor());

        String content = " Test Content ";
        assertEquals("Test Content", documentHelper.getContent(null, responseData, content, dataMap));
    }

# Bigger Applications - Multiple Files { #bigger-applications-multiple-files }

If you are building an application or a web API, it's rarely the case that you can put everything in a single file.

**FastAPI** provides a convenience tool to structure your application while keeping all the flexibility.

/// info

If you come from Flask, this would be the equivalent of Flask's Blueprints.

///

## An example file structure { #an-example-file-structure }