* java.io.Serializable} instance, and is thus declared an {@code Object}. For example, it might
   * be declared as a {@code List}.
   *
   * <p>Note also that serialization is not in general required to return an object that is
   * {@linkplain Object#equals equal} to the original, nor is it required to return even an object
   * of the same class. For example, if sublists of {@code MyList} instances were serializable,

  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>com.example.group</groupId>
    <artifactId>com-parent</artifactId>
    <version>RELEASE</version>
  </parent>
  <groupId>com.example.group</groupId>
  <artifactId>valid-version-wrong</artifactId>
  <version>1.0</version>

  <description>

* **`200 - 299`** are for "Successful" responses. These are the ones you would use the most.
    * `200` is the default status code, which means everything was "OK".
    * Another example would be `201`, "Created". It is commonly used after creating a new record in the database.

        String urlWithTabs = "http://example.com/path\twith\ttabs";
        StatsKeyObject key = new StatsKeyObject("test");
        key.setUrl(urlWithTabs);

        crawlerStatsHelper.begin(key);
        crawlerStatsHelper.done(key);

        String logMessage = localLogMsg.get();
        assertTrue(logMessage.contains("url:http://example.com/path with tabs"));

    ;

    open fun encode(codePoint: Int): String = throw UnsupportedOperationException()
  }

  enum class Component {
    USER {
      override fun urlString(value: String): String = "http://$value@example.com/"

      override fun encodedValue(url: HttpUrl): String = url.encodedUsername

      override operator fun set(
        builder: HttpUrl.Builder,
        value: String,
      ) {

            String line = raw.trim();

            if (line.equals("====")) {  // first ====
                // Toggle example block
                if (!inExample) {
                    inExample = true;
                    currentSnippets.clear();
                } else {
                    // Closing an example block: check for reversed order only
                    flagIfReversed(file, errors, currentSnippets);

For example, you could decide to read and validate the request with your own code, without using the automatic features of FastAPI with Pydantic, but you could still want to define the request in the OpenAPI schema.

You could do that with `openapi_extra`:

{* ../../docs_src/path_operation_advanced_configuration/tutorial006_py310.py hl[19:36, 39:40] *}

## Using `Union` or `Optional` { #using-union-or-optional }

If your code for some reason can't use `|`, for example if it's not in a type annotation but in something like `response_model=`, instead of using the vertical bar (`|`) you can use `Union` from `typing`.

For example, you could declare that something could be a `str` or `None`:

```python
from typing import Union


def say_hi(name: Union[str, None]):

Caso você queira retornar códigos de status adicionais além do código principal, você pode fazer isso retornando um `Response` diretamente, como por exemplo um `JSONResponse`, e definir os códigos de status adicionais diretamente.

Por exemplo, vamos dizer que você deseja ter uma *operação de rota* que permita atualizar itens, e retornar um código de status HTTP 200 "OK" quando for bem sucedido.

The `TestClient` is based on [HTTPX](https://www.python-httpx.org), and luckily, we can use it directly to test the API.

## Example { #example }

For a simple example, let's consider a file structure similar to the one described in [Bigger Applications](../tutorial/bigger-applications.md) and [Testing](../tutorial/testing.md):

```
.
├── app
│   ├── __init__.py