if isHeaderOnlyType(hdr.Typeflag) {
		nb = 0
	}
	if nb < 0 {
		return ErrHeader
	}

	tr.pad = blockPadding(nb)
	tr.curr = &regFileReader{r: tr.r, nb: nb}
	return nil
}

// handleSparseFile checks if the current file is a sparse format of any type
// and sets the curr reader appropriately.
func (tr *Reader) handleSparseFile(hdr *Header, rawHdr *block) error {
	var spd sparseDatas
	var err error

    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.

    * the server.
    */
    int NTLMSSP_REQUEST_TARGET = 0x00000004;

    /**
    * Specifies that communication across the authenticated channel
    * should carry a digital signature (message integrity).
    */
    int NTLMSSP_NEGOTIATE_SIGN = 0x00000010;

    /**
    * Specifies that communication across the authenticated channel
    * should be encrypted (message confidentiality).

    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.

     * the server.
     */
    int NTLMSSP_REQUEST_TARGET = 0x00000004;

    /**
     * Specifies that communication across the authenticated channel
     * should carry a digital signature (message integrity).
     */
    int NTLMSSP_NEGOTIATE_SIGN = 0x00000010;

    /**
     * Specifies that communication across the authenticated channel

**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 }

}

type latencyStat struct {
	lastmin lastMinuteLatency
	curr    time.Duration
	avg     time.Duration
	peak    time.Duration
	N       int64
}

func (l *latencyStat) update(d time.Duration) {
	l.lastmin.add(d)
	l.N++
	if d > l.peak {
		l.peak = d
	}
	l.curr = l.lastmin.getTotal().avg()
	l.avg = time.Duration((int64(l.avg)*(l.N-1) + int64(l.curr)) / l.N)
}

   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。

    Comme toujours, avec FastAPI vous pouvez combiner `def` et `async def` selon vos besoins.

    Si vous avez besoin d'un rappel sur quand utiliser l'un ou l'autre, consultez la section _« In a hurry? »_ dans la documentation à propos de [`async` et `await`](../async.md#in-a-hurry).

9. Cette *fonction de chemin d'accès* ne renvoie pas des dataclasses (même si elle le pourrait), mais une liste de dictionnaires contenant des données internes.

    SettableFuture<String> orig = SettableFuture.create();
    SettableFuture<String> prev = orig;
    for (int i = 0; i < 100000; i++) {
      SettableFuture<String> curr = SettableFuture.create();
      prev.setFuture(curr);
      prev = curr;
    }
    // prev represents the 'innermost' future
    prev.set("done");
    assertTrue(orig.isDone());
  }