*     no change will be made.
   * @return the count of the element before the operation; possibly zero
   * @throws IllegalArgumentException if {@code occurrences} is negative, or if this operation would
   *     result in more than {@link Integer#MAX_VALUE} occurrences of the element

# Request Parameters

Here's the reference information for the request parameters.

These are the special functions that you can put in *path operation function* parameters or dependency functions with `Annotated` to get data from the request.

It includes:

* `Query()`
* `Path()`
* `Body()`
* `Cookie()`
* `Header()`
* `Form()`
* `File()`

You can import them all directly from `fastapi`:

```python

Estos `examples` específicos de **OpenAPI** van en otra sección en la especificación de OpenAPI. Van en los **detalles para cada *path operation***, no dentro de cada JSON Schema.

Y Swagger UI ha soportado este campo particular de `examples` por un tiempo. Así que, puedes usarlo para **mostrar** diferentes **ejemplos en la interfaz de documentación**.

```console
$ pip install jinja2

---> 100%
```

</div>

## 使用 `Jinja2Templates` { #using-jinja2templates }

- 匯入 `Jinja2Templates`。
- 建立一個可重複使用的 `templates` 物件。
- 在會回傳模板的「*路徑操作（path operation）*」中宣告一個 `Request` 參數。
- 使用你建立的 `templates` 來渲染並回傳 `TemplateResponse`，傳入模板名稱、`request` 物件，以及在 Jinja2 模板中使用的「context」鍵值對字典。

{* ../../docs_src/templates/tutorial001_py310.py hl[4,11,15:18] *}

/// note

   * loaded) value, or null. Multiple concurrent calls to {@link Cache} lookup methods on an absent
   * value can result in multiple misses, all returning the results of a single cache load
   * operation.
   */
  public long missCount() {
    return missCount;
  }

  /**
   * Returns the ratio of cache requests which were misses. This is defined as {@code missCount /

    offerAll(elements.iterator());
  }

  /**
   * Adds each member of {@code elements} as a candidate for the top {@code k} elements. This
   * operation takes amortized linear time in the length of {@code elements}. The iterator is
   * consumed after this operation completes.
   *
   * <p>If all input data to this {@code TopKSelector} is in a single {@code Iterator}, prefer

   * loaded) value, or null. Multiple concurrent calls to {@link Cache} lookup methods on an absent
   * value can result in multiple misses, all returning the results of a single cache load
   * operation.
   */
  public long missCount() {
    return missCount;
  }

  /**
   * Returns the ratio of cache requests which were misses. This is defined as {@code missCount /

* case-sensitive
* case-insensitive

* uygulamayı serve etmek
* sayfayı serve etmek

* app
* application

* request
* response
* error response

* path operation
* path operation decorator
* path operation function

* body
* request body
* response body
* JSON body
* form body
* file body
* function body

* parameter
* body parameter
* path parameter

    return values().contains(value);
  }

  /**
   * Guaranteed to throw an exception and leave the table unmodified.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public final void clear() {
    throw new UnsupportedOperationException();
  }

  /**

///

### Path operation 関数 { #path-operation-functions }

*path operation 関数* を `async def` ではなく通常の `def` で宣言した場合、(サーバをブロックしてしまうため) 直接呼び出されるのではなく、外部のスレッドプールで実行され、それを待機します。