Se você precisar de uma atualização sobre quando usar qual, confira a seção _"Com pressa?"_ na documentação sobre [`async` e `await`](../async.md#in-a-hurry){.internal-link target=_blank}.

9. Esta *função de operação de rota* não está retornando dataclasses (embora pudesse), mas uma lista de dicionários com dados internos.

 * java.util.function.Supplier}, making conversion code necessary only in one direction. At that
 * time, this interface will be officially discouraged.
 *
 * @author Harry Heymann
 * @since 2.0
 */
@GwtCompatible
public interface Supplier<T extends @Nullable Object> {
  /**
   * Retrieves an instance of the appropriate type. The returned object may or may not be a new

8️⃣. 👀 👈 👉 *➡ 🛠️ 🔢* ⚙️ 🥔 `def` ↩️ `async def`.

    🕧, FastAPI 👆 💪 🌀 `def` & `async def` 💪.

    🚥 👆 💪 ↗️ 🔃 🕐❔ ⚙️ ❔, ✅ 👅 📄 _"🏃 ❓" _ 🩺 🔃 <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank" class="internal-link">`async` &amp; `await`</a>.

9️⃣. 👉 *➡ 🛠️ 🔢* 🚫 🛬 🎻 (👐 ⚫️ 💪), ✋️ 📇 📖 ⏮️ 🔗 💽.

    FastAPI 🔜 ⚙️ `response_model` 🔢 (👈 🔌 🎻) 🗜 📨.

 * class. Similarly, if you know that a given string represents a domain name, use {@link
 * InternetDomainName} rather than this class.
 *
 * @author Craig Berry
 * @since 5.0
 */
@J2ktIncompatible
@GwtIncompatible
public final class HostSpecifier {

  private final String canonicalForm;

  private HostSpecifier(String canonicalForm) {

Date:   Mon Nov 8 08:41:27 2021 -0800

    Close stream on panic (#13605)

    Always close streamHTTPResponse on panic on main thread to avoid
    write/flush after response handler has returned.
```

```
λ git cherry-pick 4f3317effea38c203c358af9cb5ce3c0e4173976
```

    return {"item_id": item_id, "q": q}
```

**Примітка**:

Стикнувшись з проблемами, не зайвим буде ознайомитися з розділом _"In a hurry?"_ про <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">`async` та `await` у документації</a>.

</details>

### Запустіть

Запустіть server з:

<div class="termy">

```console

 * them as a {@link String}. Example:
 *
 * {@snippet :
 * Joiner joiner = Joiner.on("; ").skipNulls();
 *  . . .
 * return joiner.join("Harry", null, "Ron", "Hermione");
 * }
 *
 * <p>This returns the string {@code "Harry; Ron; Hermione"}. Note that all input elements are
 * converted to strings using {@link Object#toString()} before being appended.
 *

@app.get("/items/{item_id}")
async def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

**Przypis**:

Jeżeli nie znasz, sprawdź sekcję _"In a hurry?"_ o <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">`async` i `await` w dokumentacji</a>.

</details>

### Uruchom

Uruchom serwer używając:

<div class="termy">

```console

 * them as a {@link String}. Example:
 *
 * {@snippet :
 * Joiner joiner = Joiner.on("; ").skipNulls();
 *  . . .
 * return joiner.join("Harry", null, "Ron", "Hermione");
 * }
 *
 * <p>This returns the string {@code "Harry; Ron; Hermione"}. Note that all input elements are
 * converted to strings using {@link Object#toString()} before being appended.
 *

@app.get("/items/{item_id}")
async def read_item(item_id: int, q: Optional[str] = None):
    return {"item_id": item_id, "q": q}
```

**Nota**:

e vuoi approfondire, consulta la sezione  _"In a hurry?"_ su <a href="https://fastapi.tiangolo.com/async/#in-a-hurry" target="_blank">`async` e `await` nella documentazione</a>.

</details>

### Esegui il server

Puoi far partire il server così:

<div class="termy">

```console