As the path of each *path operation* has to start with `/`, like in:

```Python hl_lines="1"
@router.get("/{item_id}")
async def read_item(item_id: str):
    ...
```

...the prefix must not include a final `/`.

So, the prefix in this case is `/items`.

```Python hl_lines="5-10  16  21" title="app/routers/items.py"
{!../../docs_src/bigger_applications/app/routers/items.py!}
```

由于每个*路径操作*的路径都必须以 `/` 开头，例如：

```Python hl_lines="1"
@router.get("/{item_id}")
async def read_item(item_id: str):
    ...
```

...前缀不能以 `/` 作为结尾。

因此，本例中的前缀为 `/items`。

我们还可以添加一个 `tags` 列表和额外的 `responses` 列表，这些参数将应用于此路由器中包含的所有*路径操作*。

	z, ok := objectAPI.(*erasureServerPools)
	if !ok {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL)
		return
	}

	vars := mux.Vars(r)

	var args dsync.LockArgs
	var lockers []dsync.NetLocker
	for path := range strings.SplitSeq(vars["paths"], ",") {
		if path == "" {
			continue
		}
		args.Resources = append(args.Resources, path)
	}

				Description: MetricDescription{
					Namespace: minioNamespace,
					Subsystem: notifySubsystem,
					Name:      "current_send_in_progress",
					Help:      "Number of concurrent async Send calls active to all targets (deprecated, please use 'minio_notify_target_current_send_in_progress' instead)",
					Type:      gaugeMetric,
				},
				Value: float64(nstats.CurrentSendCalls),
			})

				clusterIDEnv = clusterIDEnv + config.Default + k
			}
			natsArgs.Streaming.Enable = streamingEnabled
			natsArgs.Streaming.ClusterID = env.Get(clusterIDEnv, kv.Get(target.NATSStreamingClusterID))
			natsArgs.Streaming.Async = env.Get(asyncEnv, kv.Get(target.NATSStreamingAsync)) == config.EnableOn
			natsArgs.Streaming.MaxPubAcksInflight = maxPubAcksInflight
		}

		if err = natsArgs.Validate(); err != nil {
			return nil, err
		}

func contextCanceled(ctx context.Context) bool {
	select {
	case <-ctx.Done():
		return true
	default:
		return false
	}
}

// bgContext returns a context that can be used for async operations.
// Cancellation/timeouts are removed, so parent cancellations/timeout will
// not propagate from parent.
// Context values are preserved.
// This can be used for goroutines that live beyond the parent context.

				globalLocalSetDrives[endpoint.PoolIdx][endpoint.SetIdx][endpoint.DiskIdx] = storage
				return true
			}

			if createStorage(endpoint) {
				continue
			}

			// Start async goroutine to create storage.
			go func(endpoint Endpoint) {
				for {
					time.Sleep(3 * time.Second)
					if createStorage(endpoint) {
						return
					}
				}
			}(endpoint)
		}
	}

	if sync {
		// Perform DirectIO along with fdatasync for larger xl.meta, mostly when
		// xl.meta has "inlined data" we prefer writing O_DIRECT and then doing
		// fdatasync() at the end instead of opening the file with O_DSYNC.
		//
		// This is an optimization mainly to ensure faster I/O.
		if len(b) > xioutil.DirectioAlignSize {
			r := bytes.NewReader(b)
			return s.writeAllDirect(ctx, filePath, r.Size(), r, flags, skipParent, true)

pkg syscall (darwin-arm64), const O_DP_GETRAWENCRYPTED = 1
pkg syscall (darwin-arm64), const O_DP_GETRAWENCRYPTED ideal-int
pkg syscall (darwin-arm64), const O_DSYNC = 4194304
pkg syscall (darwin-arm64), const O_DSYNC ideal-int
pkg syscall (darwin-arm64), const O_EVTONLY = 32768
pkg syscall (darwin-arm64), const O_EVTONLY ideal-int
pkg syscall (darwin-arm64), const O_EXCL = 2048

pkg syscall (netbsd-arm64-cgo), const O_DIRECTORY = 2097152
pkg syscall (netbsd-arm64-cgo), const O_DIRECTORY ideal-int
pkg syscall (netbsd-arm64-cgo), const O_DSYNC = 65536
pkg syscall (netbsd-arm64-cgo), const O_DSYNC ideal-int
pkg syscall (netbsd-arm64-cgo), const O_EXCL = 2048
pkg syscall (netbsd-arm64-cgo), const O_EXLOCK = 32
pkg syscall (netbsd-arm64-cgo), const O_EXLOCK ideal-int