Ensuite, nous pourrions utiliser ce `checker` dans un `Depends(checker)`, au lieu de `Depends(FixedContentQueryChecker)`, car la dépendance est l’instance, `checker`, et non la classe elle‑même.

Et lors de la résolution de la dépendance, **FastAPI** appellera ce `checker` comme ceci :

```Python
checker(q="somequery")
```

        expect:

 * atomic unless otherwise noted.
 *
 * <p>Instances of this class are serializable if the keys are serializable.
 *
 * <p><b>Note:</b> If your values are always positive and less than 2^31, you may wish to use a
 * {@link com.google.common.collect.Multiset} such as {@link
 * com.google.common.collect.ConcurrentHashMultiset} instead.
 *

If the **human effort** put in a PR, e.g. writing LLM prompts, is **less** than the **effort we would need to put** to **review it**, please **don't** submit the PR.

Think of it this way: we can already write LLM prompts or run automated tools ourselves, and that would be faster than reviewing external PRs.

   <span style="background-color:#007166"><font color="#D3D7CF"> server </font></span>  Documentation at <font color="#729FCF"><u style="text-decoration-style:solid">http://0.0.0.0:8000/docs</u></font>

             Logs:

     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Uvicorn running on <font color="#729FCF"><u style="text-decoration-style:solid">http://0.0.0.0:8000</u></font> <b>(</b>Press CTRL+C to

This idea of **asynchronous** code described above is also sometimes called **"concurrency"**. It is different from **"parallelism"**.

**Concurrency** and **parallelism** both relate to "different things happening more or less at the same time".

But the details between *concurrency* and *parallelism* are quite different.

To see the difference, imagine the following story about burgers:

### Concurrent Burgers { #concurrent-burgers }

        assertEquals("5.5 GB/s", builder.build());
    }

    @Test
    void testFormatRateThresholds() {
        FileSizeFormat format = new FileSizeFormat();

        // Test value less than 0.05
        // Test exact unit thresholds
        MessageBuilder builder = new DefaultMessageBuilder();
        format.formatRate(builder, 45.0); // 45 B/s
        assertEquals("45.0 B/s", builder.build());

## Utiliser `async` ou non { #to-async-or-not-to-async }

Comme les dépendances seront aussi appelées par **FastAPI** (tout comme vos fonctions de chemins d’accès), les mêmes règles s’appliquent lors de la définition de vos fonctions.

Vous pouvez utiliser `async def` ou un `def` normal.

	errMetaCode := checkMetaHeaders(extractedSignedHeaders, r)
	if errMetaCode != ErrNone {
		return errMetaCode
	}

	// If the host which signed the request is slightly ahead in time (by less than globalMaxSkewTime) the
	// request should still be allowed.
	if pSignValues.Date.After(UTCNow().Add(globalMaxSkewTime)) {
		return ErrRequestNotReadyYet
	}

Donc, en coulisses, cela fonctionnera comme si tout faisait partie d'une seule et même application.

///

/// check | Vérifications

Vous n'avez pas à vous soucier de la performance lors de l'inclusion de routeurs.

Cela prendra des microsecondes et ne se produira qu'au démarrage.

Donc cela n'affectera pas la performance. ⚡

///