* `tags: List[str] = []` 默认值为一个空列表：`[]`。

但如果它们并没有被实际存储，你可能希望在结果中省略这些默认值。

例如，当你在 NoSQL 数据库中保存了具有许多可选属性的模型，但又不想发送充满默认值的冗长 JSON 响应。

### 使用 `response_model_exclude_unset` 参数 { #use-the-response-model-exclude-unset-parameter }

你可以设置*路径操作装饰器*参数 `response_model_exclude_unset=True`：

{* ../../docs_src/response_model/tutorial004_py310.py hl[22] *}

这样响应中将不会包含那些默认值，而只包含实际设置的值。

			EndSessionEndpoint:      cfg.DiscoveryDoc.EndSessionEndpoint,
			RoleArn:                 cfg.GetRoleArn(),
		}
	}
	return m
}

func initConsoleServer() (*consoleapi.Server, error) {
	// unset all console_ environment variables.
	for _, cenv := range env.List(consolePrefix) {
		os.Unsetenv(cenv)
	}

	// enable all console environment variables
	minioConfigToConsoleFeatures()

	switch {
	case isCompressed:
		var firstPart int
		if opts.PartNumber > 0 {
			// firstPart is an index to Parts slice,
			// make sure that PartNumber uses the
			// index value properly.
			firstPart = opts.PartNumber - 1
		}

		// If compressed, we start from the beginning of the part.
		// Read the decompressed size from the meta.json.

        }
    }

    /**
     * Processes a streaming chat request using Server-Sent Events (SSE).
     * Uses the enhanced multi-phase RAG flow with intent detection and result evaluation.
     *
     * @param request the HTTP request
     * @param response the HTTP response
     * @throws IOException if an I/O error occurs

      manager.startAsync().awaitHealthy();
      manager.stopAsync().awaitStopped(10, SECONDS);
    }
  }

  /**
   * This service will shut down very quickly after stopAsync is called and uses a background thread
   * so that we know that the stopping() listeners will execute on a different thread than the
   * terminated() listeners.
   */

# Bases de Datos SQL (Relacionales) { #sql-relational-databases }

**FastAPI** no requiere que uses una base de datos SQL (relacional). Pero puedes utilizar **cualquier base de datos** que desees.

Aquí veremos un ejemplo usando [SQLModel](https://sqlmodel.tiangolo.com/).

type ObjectSegmentReaderFn func(offset int64) (io.ReadCloser, error)

// ObjectReadSeekCloser implements ReadSeekCloser interface for reading objects.
// It uses a function that returns a io.ReadCloser for the object.
type ObjectReadSeekCloser struct {
	segmentReader ObjectSegmentReaderFn

	size   int64 // actual object size regardless of compression/encryption
	offset int64

  private static final int CUTOFF = (int) (MAX_TABLE_SIZE * DESIRED_LOAD_FACTOR);

  /**
   * Returns an array size suitable for the backing array of a hash table that uses open addressing
   * with linear probing in its implementation. The returned size is the smallest power of two that
   * can hold setSize elements with the desired load factor. Always returns at least setSize + 2.
   */

      // If this is a conditional request, we'll increment hitCount if/when it hits.
      networkCount++
    } else if (cacheStrategy.cacheResponse != null) {
      // This response uses the cache and not the network. That's a cache hit.
      hitCount++
    }
  }

  @Synchronized internal fun trackConditionalCacheHit() {
    hitCount++
  }

### In a Remote Server { #in-a-remote-server }

When you set up a remote server (a cloud server, a virtual machine, etc.) the simplest thing you can do is use `fastapi run` (which uses Uvicorn) or something  similar, manually, the same way you do when developing locally.

And it will work and will be useful **during development**.