/// tip | Astuce

En ajoutant `standard`, Uvicorn va installer et utiliser quelques dépendances supplémentaires recommandées.

Cela inclut `uvloop`, le remplaçant hautes performances de `asyncio`, qui fournit le gros gain de performance en matière de concurrence.

Lorsque vous installez FastAPI avec quelque chose comme `pip install "fastapi[standard]"`, vous obtenez déjà `uvicorn[standard]` aussi.

  @GwtIncompatible // java.math.BigInteger
  public void testMean() {
    // Odd-sized ranges have an obvious mean
    assertMean(2, 1, 3);

    assertMean(-2, -3, -1);
    assertMean(0, -1, 1);
    assertMean(1, -1, 3);
    assertMean((1 << 30) - 1, -1, Integer.MAX_VALUE);

    // Even-sized ranges should prefer the lower mean
    assertMean(2, 1, 4);
    assertMean(-3, -4, -1);
    assertMean(0, -1, 2);

	Expires            = "Expires"
	ContentLength      = "Content-Length"
	ContentLanguage    = "Content-Language"
	ContentRange       = "Content-Range"
	Connection         = "Connection"
	AcceptRanges       = "Accept-Ranges"
	AmzBucketRegion    = "X-Amz-Bucket-Region"
	ServerInfo         = "Server"
	RetryAfter         = "Retry-After"
	Location           = "Location"
	CacheControl       = "Cache-Control"

{* ../../docs_src/settings/app02_an_py310/main.py hl[17,19:21] *}

### Configurações e testes { #settings-and-testing }

Então seria muito fácil fornecer um objeto de configurações diferente durante os testes criando uma sobrescrita de dependência para `get_settings`:

{* ../../docs_src/settings/app02_an_py310/test_main.py hl[9:10,13,21] *}

* [LastaFlute](https://github.com/lastaflute/lastaflute "LastaFlute") : Framework Web
* [Lasta Job](https://github.com/lastaflute/lasta-job "Lasta Job") : Planificateur de tâches
* [Fess Crawler](https://github.com/codelibs/fess-crawler "Fess Crawler") : Crawler Web

    return cmp > 0 | (cmp == 0 & getUpperBoundType() == OPEN);
  }

  boolean contains(@ParametricNullness T t) {
    return !tooLow(t) && !tooHigh(t);
  }

  /**
   * Returns the intersection of the two ranges, or an empty range if their intersection is empty.
   */
  @SuppressWarnings("nullness") // TODO(cpovirk): Add casts as needed. Will be noisy and annoying...
  GeneralRange<T> intersect(GeneralRange<T> other) {

 * - No complex dependencies
 */
public class SimpleCircuitBreaker {

    private static final Logger log = LoggerFactory.getLogger(SimpleCircuitBreaker.class);

    /**
     * Circuit breaker states
     */
    public enum State {
        CLOSED, // Normal operation
        OPEN, // Failing, requests blocked
        HALF_OPEN // Testing recovery
    }

    private final String name;

   *
   * <p>This implementation tries to be smart in a number of ways. It recognizes cases where the
   * negation is cheaper to precompute than the matcher itself; it tries to build small hash tables
   * for matchers that only match a few characters, and so on. In the worst-case scenario, it
   * constructs an eight-kilobyte bit array and queries that. In many situations this produces a

使用 `check_same_thread=False` 允許 FastAPI 在不同執行緒中使用同一個 SQLite 資料庫。這是必要的，因為「單一請求」可能會使用「多個執行緒」（例如在依賴項中）。

別擔心，依照我們的程式結構，稍後我們會確保「每個請求只使用單一 SQLModel 的 session」，這其實就是 `check_same_thread` 想要達成的事。

### 建立資料表 { #create-the-tables }

接著我們新增一個函式，使用 `SQLModel.metadata.create_all(engine)` 為所有「資料表模型」建立資料表。

{* ../../docs_src/sql_databases/tutorial001_an_py310.py ln[21:22] hl[21:22] *}

### 建立 Session 依賴 { #create-a-session-dependency }

  /**
   * {@inheritDoc}
   *
   * <p>This method returns a serializable {@code ImmutableSortedSet}.
   *
   * <p>The {@link SortedSet#headSet} documentation states that a subset of a subset throws an
   * {@link IllegalArgumentException} if passed a {@code toElement} greater than an earlier {@code
   * toElement}. However, this method doesn't throw an exception in that situation, but instead