async def get_token(token: Annotated[str, Depends(oauth2_scheme)]) -> str:
    return token


app = FastAPI(dependencies=[Depends(get_token)])


@app.get("/")
async def root():
    return {"message": "Hello World"}


@app.get(
    "/with-oauth2-scheme",
    dependencies=[Security(oauth2_scheme, scopes=["read", "write"])],
)
async def read_with_oauth2_scheme():
    return {"message": "Admin Access"}

你可以發送如下的請求：

```json
{
    "description": "Some data",
    "data": "aGVsbG8="
}
```

/// tip

`aGVsbG8=` 是 `hello` 的 base64 編碼。

///

接著 Pydantic 會將該 base64 字串解碼，並在模型的 `data` 欄位中提供原始位元組。

你會收到類似以下的回應：

```json
{
  "description": "Some data",
  "content": "hello"
}
```

## Pydantic `bytes` 用於輸出資料 { #pydantic-bytes-for-output-data }

            while (index < end && !Character.isLetter(csq.charAt(index))) {
              index++;
            }
            return index;
          }
        };
    assertThat(e.escape("\0HeLLo \uD800\uDC00 WorlD!\n"))
        .isEqualTo("\0HELLO \uD800\uDC00 WORLD!\n");
  }

  public void testCodePointAt_indexOutOfBoundsException() {
    assertThrows(

    val httpClient =
      HttpClient
        .newBuilder()
        .followRedirects(NORMAL)
        .build()

    server.enqueue(
      MockResponse
        .Builder()
        .body("hello, Java HTTP Client")
        .build(),
    )

    val request =
      HttpRequest
        .newBuilder(server.url("/").toUri())
        .header("Accept", "text/plain")
        .build()

    public String projectName() {
        return "elasticsearch.build";
    }

    public void testPluginCanBeApplied() {
        BuildResult result = getGradleRunner().withArguments("hello", "-s").build();
        assertTaskSuccessful(result, ":hello");
        assertOutputContains("build plugin can be applied");
    }

    public void testCheckTask() {
        setupJarJdkClasspath(getProjectDir());

          "bromfiets=>bromfiets",
          "ei=>eier",
          "kind=>kinder"
        ]
      },
      "english_keywords": {
        "type":       "keyword_marker",
        "keywords":   ["hello"]
      },
      "finnish_stop": {
        "type":       "stop",
        "stopwords":  "_finnish_"
      },
      "finnish_keywords": {
        "type":       "keyword_marker",

        .Builder()
        .body("hello, Apache HttpClient 5.x")
        .build(),
    )

    val request = HttpGet(server.url("/").toUri())
    request.addHeader("Accept", "text/plain")

    @Suppress("DEPRECATION")
    httpClient.execute(request).use { response ->
      assertThat(response.code).isEqualTo(200)
      assertThat(EntityUtils.toString(response.entity)).isEqualTo("hello, Apache HttpClient 5.x")
    }

Hello World!...

hello world dir/bar foo readonly important...

    "data": "aGVsbG8="
}
```

/// tip | İpucu

`aGVsbG8=` değeri, `hello` kelimesinin base64 encoding'idir.

///

Sonrasında Pydantic base64 string'ini decode eder ve modelin `data` alanında size orijinal bytes'ı verir.

Şöyle bir response alırsınız:

```json
{
  "description": "Some data",
  "content": "hello"
}
```

## Çıkış Verisi için Pydantic `bytes` { #pydantic-bytes-for-output-data }