out.writeByte((byte) 200);
    out.writeChar('a');
    out.writeShort((short) -30000);
    out.writeShort((short) 50000);
    out.writeInt(0xCAFEBABE);
    out.writeLong(0xDEADBEEFCAFEBABEL);
    out.writeUTF("Herby Derby");
    out.writeFloat(Float.intBitsToFloat(0xCAFEBABE));
    out.writeDouble(Double.longBitsToDouble(0xDEADBEEFCAFEBABEL));

    byte[] data = baos.toByteArray();

    /* Setup input streams */

    out.writeByte((byte) 200);
    out.writeChar('a');
    out.writeShort((short) -30000);
    out.writeShort((short) 50000);
    out.writeInt(0xCAFEBABE);
    out.writeLong(0xDEADBEEFCAFEBABEL);
    out.writeUTF("Herby Derby");
    out.writeFloat(Float.intBitsToFloat(0xCAFEBABE));
    out.writeDouble(Double.longBitsToDouble(0xDEADBEEFCAFEBABEL));

    byte[] data = baos.toByteArray();

    /* Setup input streams */

    }

    @Test
    public void test_getWords() throws Exception {
        List<String> words = new ArrayList<>();
        words.add("apple");
        words.add("banana");
        words.add("cherry");

        PopularWordsResponse response = new PopularWordsResponse("test-index", 100, words, 10, new ArrayList<>());

        assertNotNull(response.getWords());
        assertEquals(3, response.getWords().size());

    out.writeByte((byte) 200);
    out.writeChar('a');
    out.writeShort((short) -30000);
    out.writeShort((short) 50000);
    out.writeInt(0xCAFEBABE);
    out.writeLong(0xDEADBEEFCAFEBABEL);
    out.writeUTF("Herby Derby");
    out.writeFloat(Float.intBitsToFloat(0xCAFEBABE));
    out.writeDouble(Double.longBitsToDouble(0xDEADBEEFCAFEBABEL));
  }

  public void testReadFully() throws IOException {

**FastAPI** provides several tools to help you deal with **Security** easily, rapidly, in a standard way, without having to study and learn all the security specifications.

But first, let's check some small concepts.

## In a hurry? { #in-a-hurry }

If you don't care about any of these terms and you just need to add security with authentication based on username and password *right now*, skip to the next chapters.

## OAuth2 { #oauth2 }

    As always, in FastAPI you can combine `def` and `async def` as needed.

    If you need a refresher about when to use which, check out the section _"In a hurry?"_ in the docs about [`async` and `await`](../async.md#in-a-hurry).

9. This *path operation function* is not returning dataclasses (although it could), but a list of dictionaries with internal data.

        {
            "year": 1952,
            "publisher": "Doubleday & Company",
            "type": "Hardcover"
        },
        {
            "year": 2000,
            "publisher": "Harry N. Abrams",
            "type": "Hardcover"
        },
        {
            "year": 2019,
            "publisher": "Ulverscroft Collections",
            "type": "Paperback",
            "pages": 294
        }

            "url": "https://fastapi.tiangolo.com/",
        },
    },
]

app = FastAPI(openapi_tags=tags_metadata)


@app.get("/users/", tags=["users"])
async def get_users():
    return [{"name": "Harry"}, {"name": "Ron"}]


@app.get("/items/", tags=["items"])
async def get_items():

    Hangisini ne zaman kullanmanız gerektiğine dair hızlı bir hatırlatma isterseniz, [`async` ve `await`](../async.md#in-a-hurry) dokümanındaki _"In a hurry?"_ bölümüne bakın.

9. Bu *path operation function* dataclass döndürmüyor (isterse döndürebilir), onun yerine dahili verilerle bir dictionary listesi döndürüyor.

   同樣地，你可以把 `dataclasses` 與標準型別註記組合使用。
8. 注意這個「路徑操作函式」使用的是一般的 `def` 而非 `async def`。

   一如往常，在 FastAPI 中你可以視需要混用 `def` 與 `async def`。

   如果需要複習何時用哪個，請參考文件中關於 [`async` 與 `await`](../async.md#in-a-hurry) 的章節「In a hurry?」。
9. 這個「路徑操作函式」回傳的不是 dataclass（雖然也可以），而是一個包含內部資料的字典清單。

   FastAPI 會使用 `response_model` 參數（其中包含 dataclass）來轉換回應。

你可以把 `dataclasses` 與其他型別註記以多種方式組合，形成複雜的資料結構。

查看上面程式碼中的註解提示以了解更具體的細節。