HEAD Object

Description

You can call this operation to obtain metadata from an object without getting the object. To call this operation, you must have the read permissions on the object.

The HEAD request and GET request on an object are fulfilled in the same way. The HEAD response is identical because it does not contain a response body.

Permission

To call this operation, you must have read permission on the object. If the requested object does not exist, Kingsoft Cloud Standard Storage Service (KS3) returns corresponding information based on whether you have read permission.

• If you have the read permissions on the bucket, KS3 returns an HTTP 404 error with the error message "no such key."
• If you do not have the read permissions on the bucket, KS3 returns an HTTP 403 error with the error message "access denied."

Request

Request syntax

HEAD /{ObjectKey} HTTP/1.1
Host: {BucketName}.{endpoint}
Date: {date}
Authorization: {SignatureValue}

References:

• Endpoints and regions
• Request signature

Request parameters

No request parameter is used.

Request headers

This operation supports all common request headers and the request headers that are described in the following table. For more information, see Common request headers.

Request body

No request body is used.

Response

Response headers

Response body

No response body is returned.

Operation-specific errors

This operation does not return operation-specific errors.

Examples

Sample request

HEAD /my-image.jpg HTTP/1.1
Host: ks3-example.ks3-cn-beijing.ksyuncs.com
Date: Wed, 28 Oct 2009 22:32:00 GMT
Authorization: authorization string

Sample response

HTTP/1.1 200 OK
Date: Wed, 28 Oct 2009 22:32:00 GMT
Last-Modified: Sun, 1 Jan 2006 12:00:00 GMT
ETag: "54a3be97af36cdc9f2516c74550fa95d"
x‑kss‑tagging‑count:2
Content-Length: 434234
Content-Type: text/plain
Connection: close
Server: Tengine
Content-MD5:VKO+l682zcnyUWx0VQ+pXQ==

Notes:

1. If an object is uploaded to KS3 in multiple parts, the Content_MD5 header will not be returned when you call the GET operation.

2. If an object is uploaded to KS3 through PUT or POST, the Content_MD5 header will be returned when you call the GET operation.

Usage notes

• The response does not involve a response body regardless of the request result.
• You can call this operation to check whether an object exists.
• You can call this operation to obtain metadata of an object.
• The x‑kss‑tagging‑count header is returned only if you have the ks3:GetObjectTagging permission on tags. If you have only the ks3:GetObject permission but not the ks3:GetObjectTagging permission, the x-kss-tagging-count header will not be returned.