return Config{}, err
	}

	ssc := env.Get(StandardEnv, kvs.Get(ClassStandard))
	rrsc := env.Get(RRSEnv, kvs.Get(ClassRRS))
	// Check for environment variables and parse into storageClass struct
	if ssc != "" {
		cfg.Standard, err = parseStorageClass(ssc)
		if err != nil {
			return Config{}, err
		}
	} else {

          $ref: '#/components/responses/NotFound'
        '500':
          $ref: '#/components/responses/InternalServerError'
          
  /health:
    get:
      tags:
        - monitor
      summary: Check a server status
      description: Returns status
      operationId: ping
      responses:
        '200':
          description: Successful operation
          content:
            application/json:

common_parameters --> read_items
common_parameters --> read_users
```

Assim, você escreve um código compartilhado apenas uma vez e o **FastAPI** se encarrega de chamá-lo em suas *operações de rota*.

/// check | "Checando"

Perceba que você não precisa criar uma classe especial e enviar a dependência para algum outro lugar em que o **FastAPI** a "registre" ou realize qualquer operação similar.

			}
			return written, nil
		}
	}
}

// SafeClose safely closes any channel of any type
func SafeClose[T any](c chan<- T) {
	if c != nil {
		close(c)
		return
	}
	// Print stack to check who is sending `c` as `nil`
	// without crashing the server.
	debug.PrintStack()

    // * Everything with (to <= index < from) should be removed.
    // * The element with (index == from) should be kept.
    // * Everything with (index > from) has not been checked yet.

    // Check from the end of the list backwards (minimize expected cost of
    // moving elements when remove() is called). Stop before 'from' because
    // we already know that should be kept.

    }

    @Override
    public int size() {
      return IntMath.saturatedAdd(rest.length, 1);
    }

    @Override
    @ParametricNullness
    public E get(int index) {
      // check explicitly so the IOOBE will have the right message
      checkElementIndex(index, size());
      return (index == 0) ? first : rest[index - 1];
    }

    @J2ktIncompatible private static final long serialVersionUID = 0;

	}
	deleteResp.Errors = errs
	return deleteResp
}

func writeResponse(w http.ResponseWriter, statusCode int, response []byte, mType mimeType) {
	if statusCode == 0 {
		statusCode = 200
	}
	// Similar check to http.checkWriteHeaderCode
	if statusCode < 100 || statusCode > 999 {
		bugLogIf(context.Background(), fmt.Errorf("invalid WriteHeader code %v", statusCode))
		statusCode = http.StatusInternalServerError
	}

/// tip

在 `APIRouter`中具有 `dependencies` 可以用来，例如，对一整组的*路径操作*要求身份认证。即使这些依赖项并没有分别添加到每个路径操作中。

///

/// check

`prefix`、`tags`、`responses` 以及 `dependencies` 参数只是（和其他很多情况一样）**FastAPI** 的一个用于帮助你避免代码重复的功能。

///

### 导入依赖项

这些代码位于 `app.routers.items` 模块，`app/routers/items.py` 文件中。

  optional string fieldRef = 2;

  // The content of type checking information in a human-readable form.
  // Each line of the warning contains the type that the expression is checked
  // against, followed by the type check error from the compiler.
  optional string warning = 3;
}

message MatchCondition {
  // Name is an identifier for this match condition, used for strategic merging of MatchConditions,

            // Maven 3.x is always using 4.0.0 version to load the supermodel, so
            // do the same when loading a dependency.  The model validator will also
            // check that field later.
            superModelVersion = MODEL_VERSION_4_0_0;
        }
        ModelData superData = new ModelData(null, getSuperModel(superModelVersion));

        // profile activation