*
   * <p>Caches loaded by a {@link CacheLoader} will call {@link CacheLoader#reload} if the cache
   * currently contains a value for {@code key}, and {@link CacheLoader#load} otherwise. Loading is
   * asynchronous only if {@link CacheLoader#reload} was overridden with an asynchronous
   * implementation.
   *

它等价于以下导入语句：

```Python
from main import app
```

///

每种 ASGI 服务器程序通常都会有类似的命令，您可以在它们的官方文档中找到更多信息。

/// warning | 警告

Uvicorn 和其他服务器支持 `--reload` 选项，该选项在开发过程中非常有用。

但 `--reload` 选项会消耗更多资源，且相对不稳定。

它对于**开发阶段**非常有帮助，但在**生产环境**中**不应该**使用。

///

## 部署概念 { #deployment-concepts }

这些示例运行服务器程序（例如 Uvicorn），启动**单个进程**，在所有 IP（`0.0.0.0`）上监听预定义端口（例如`80`）。

## `fastapi dev` { #fastapi-dev }

Ejecutar `fastapi dev` inicia el modo de desarrollo.

                // Implementation for raw payload
            }

            @Override
            public byte[] getRawPayload() {
                // Implementation for getting raw payload
                return null;
            }

            @Override
            public boolean isRetainPayload() {
                // Implementation for retain payload flag
                return false;
            }

        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        username = payload.get("sub")
        if username is None:
            raise credentials_exception
        token_data = TokenData(username=username)
    except InvalidTokenError:

    private @interface ValidCronRequired {
        String message() default "Must be a valid non-blank cron expression";

        Class<?>[] groups() default {};

        Class<? extends jakarta.validation.Payload>[] payload() default {};
    }

    private static class ComposedBean {
        @ValidCronRequired
        private String composedCron;

        public String getComposedCron() {

          message == "Plaintext before ENCRYPTION" || message == "Plaintext after DECRYPTION" -> Type.Plaintext
          message.startsWith("System property ") -> Type.Setup
          message.startsWith("Reload ") -> Type.Setup
          message == "No session to resume." -> Type.Handshake
          message.startsWith("Consuming ") -> Type.Handshake
          message.startsWith("Produced ") -> Type.Handshake

            thread.start();
        }

        for (Thread thread : threads) {
            thread.join();
        }

        // Due to synchronized method, only one thread should reload
        // The count might be 2 (one initial + one reload) or slightly higher due to timing
        assertTrue(loadCount[0] <= 3, "Load count should be small due to synchronization");
    }

        id: slack
        uses: slackapi/slack-github-action@v3.0.1
        with:
          webhook: ${{ secrets.IDE_EXPERIENCE_TEAM_SLACK_WEBHOOK_URL }}
          webhook-type: incoming-webhook
          payload: |
            text: "<https://github.com/gradle/gradle/${{ github.event.ref }}|[gradle/gradle#${{ github.event.ref }}]> has been pushed"
            blocks:
              - type: "section"
                text:

        void testVerifyFailedState() {
            assertFalse(testBlock.isVerifyFailed());
        }

        @Test
        @DisplayName("Test raw payload handling")
        void testRawPayloadHandling() {
            byte[] payload = new byte[] { 1, 2, 3, 4, 5 };

            assertNull(testBlock.getRawPayload());
            assertFalse(testBlock.isRetainPayload());