},
        "MetaUsr": {
          "content-type": "application/octet-stream",
          "etag": "20000f00f58c508b40720270929bd90e9f07b9bd78fb605e5432a67635fc34722e4fc53b1d5fab9ff8400eb9ded4fba2"
        }
      }
    }
  ]
}
```

### v1.3+ versions

		parts []CompletePart
	}{
		// inputParts - 0.
		// Case for replicating ETag mismatch.
		{
			[]CompletePart{
				{ETag: "abcd", PartNumber: 1},
			},
		},
		// inputParts - 1.
		// should error out with part too small.
		{
			[]CompletePart{
				{ETag: "e2fc714c4727ee9395f324cd2e7f331f", PartNumber: 1},
				{ETag: "1f7690ebdd9b4caf8fab49ca1757bf27", PartNumber: 2},
			},
		},

type Config struct {
	// Flag indicating whether cache is enabled.
	Enable bool `json:"enable"`

	// Endpoint for caching uses remote mcache server to
	// store and retrieve pre-condition check entities such as
	// Etag and ModTime of an object + version
	Endpoint string `json:"endpoint"`

	// BlockSize indicates the maximum object size below which
	// data is cached and fetched remotely from DRAM.
	BlockSize int64

type PartTooBig struct{}

func (e PartTooBig) Error() string {
	return "Part size bigger than the allowed limit"
}

// InvalidETag error returned when the etag has changed on disk
type InvalidETag struct{}

func (e InvalidETag) Error() string {
	return "etag of the object has changed"
}

// BackendDown is returned for network errors
type BackendDown struct {
	Err string
}

	AmzFwdHeaderChecksumSha256     = "x-amz-fwd-header-x-amz-checksum-sha256"
	AmzFwdHeaderDeleteMarker       = "x-amz-fwd-header-x-amz-delete-marker"
	AmzFwdHeaderETag               = "x-amz-fwd-header-ETag"
	AmzFwdHeaderExpires            = "x-amz-fwd-header-Expires"
	AmzFwdHeaderExpiration         = "x-amz-fwd-header-x-amz-expiration"
	AmzFwdHeaderLastModified       = "x-amz-fwd-header-Last-Modified"

	"net/http"
	"net/url"
	"strconv"
	"strings"
	"sync/atomic"
	"time"

	"github.com/minio/minio/internal/auth"
	objectlock "github.com/minio/minio/internal/bucket/object/lock"
	"github.com/minio/minio/internal/etag"
	"github.com/minio/minio/internal/hash"
	xhttp "github.com/minio/minio/internal/http"
	xjwt "github.com/minio/minio/internal/jwt"
	"github.com/minio/minio/internal/logger"
	"github.com/minio/minio/internal/mcontext"

			return
		}
		globalScannerMetrics.timeILM(lae.Action)(1)
	}()

	opts := ObjectOptions{
		Transition: TransitionOptions{
			Status: lifecycle.TransitionPending,
			Tier:   lae.StorageClass,
			ETag:   oi.ETag,
		},
		LifecycleAuditEvent: lae,
		VersionID:           oi.VersionID,
		Versioned:           globalBucketVersioningSys.PrefixEnabled(oi.Bucket, oi.Name),

	if err != nil {
		t.Error("Unexpected error: ", err)
	}

	v := redirectURL.Query()
	v.Add("bucket", info.Bucket)
	v.Add("key", info.Name)
	v.Add("etag", "\""+info.ETag+"\"")
	redirectURL.RawQuery = v.Encode()
	expectedLocation := redirectURL.String()

	// Check the new location url
	if rec.Header().Get("Location") != expectedLocation {

* `path` - 要流式传输的文件的文件路径。
* `headers` - 任何自定义响应头，传入字典类型。
* `media_type` - 给出媒体类型的字符串。如果未设置，则文件名或路径将用于推断媒体类型。
* `filename` - 如果给出，它将包含在响应的 `Content-Disposition` 中。

文件响应将包含适当的 `Content-Length`，`Last-Modified` 和 `ETag` 的响应头。

```Python hl_lines="2  10"
{!../../../docs_src/custom_response/tutorial009.py!}
```

## 额外文档

   *
   * @since 28.2
   */
  public static final String CROSS_ORIGIN_OPENER_POLICY = "Cross-Origin-Opener-Policy";
  /** The HTTP {@code ETag} header field name. */
  public static final String ETAG = "ETag";
  /** The HTTP {@code Expires} header field name. */
  public static final String EXPIRES = "Expires";
  /** The HTTP {@code Last-Modified} header field name. */