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Obtaining Bucket Metadata

Functions

This operation queries the metadata of a bucket. To use this operation, you must have the permission to read the bucket.

Request Syntax

HEAD / HTTP/1.1 
Host: bucketname.obs.region.example.com
Date: date
Authorization: authorization

Request Parameters

This request contains no parameters.

Request Headers

This request uses common headers. For details, see Table 3.

If you want to get CORS configuration information, you must use the headers in Table 1.

Table 1 Request headers for obtaining CORS configuration

Header

Type

Mandatory (Yes/No)

Description

Origin

String

Yes

Explanation:

Origin of the cross-domain request specified by the pre-request. Generally, it is a domain name.

Restrictions:

You can enter multiple origins, with one separated from another using a line break. Each origin can contain at most one wildcard character (*).

Value range:

An HTTP-compliant header value

Default value:

None

Access-Control-Request-Headers

String

No

Explanation:

HTTP headers in a request

Restrictions:

You can enter multiple allowed headers, with one separated from another using a line break. Each header can contain one wildcard character (*) at most. Spaces, ampersands (&), colons (:), and less-than signs (<) are not allowed.

Value range:

An HTTP-compliant header value

Default value:

None

Request Elements

This request contains no elements.

Response Syntax

HTTP/1.1 status_code
x-obs-bucket-location: region
Date: date

Response Headers

The response to the request uses common headers. For details, see Table 1.

In addition to the common response headers, the headers listed in Table 2 may be used.

Table 2 Additional response headers

Header

Type

Description

x-obs-bucket-location

String

Explanation:

The region where the bucket resides.

Restrictions:

None

Value range:

None

Default value:

None

x-obs-storage-class

String

Explanation:

Default storage class of the bucket.

Restrictions:

None

Value range:

  • STANDARD (Standard storage)
  • WARM (Warm storage)
  • COLD(Cold storage)

Default value:

None

x-obs-version

String

Explanation:

OBS version of the bucket.

Restrictions:

None

Value range:

  • 3.0: bucket of the latest version
  • --: bucket of an earlier version

Default value:

None

x-obs-fs-file-interface

String

Explanation:

Whether it is a parallel file system

Restrictions:

If this header field is not carried, the bucket is not a parallel file system.

Value range:

The value can be Enabled (parallel file system).

Default value:

None

x-obs-epid

String

Explanation:

Enterprise project ID for the current bucket. Users who have enabled the enterprise project function can obtain the ID from the enterprise project service.

Restrictions:

The value is a UUID. This parameter is not required if you have not enabled an enterprise project.

Default value:

None

x-obs-az-redundancy

String

Explanation:

Specifies an AZ redundancy type.

Value 3az indicates that data is stored in multiple AZs in the same region.

If this header field is not carried, data is stored in a single AZ.

Restrictions:

Multi-AZ redundancy is not available for Cold storage. If the region where the bucket is located does not support multi-AZ storage, single-AZ storage is used by default.

Value range:

If multi-AZ storage is configured for the bucket, 3az is returned. If single-AZ storage is configured for the bucket, None is returned.

Default value:

None

Access-Control-Allow-Origin

String

Explanation:

Indicates that the origin is included in the response if the origin in the request meets the CORS configuration requirements when CORS is configured for buckets.

Restrictions:

None

Value range:

The value that complies with the CORS

Default value:

None

Access-Control-Allow-Headers

String

Explanation:

Indicates that the headers are included in the response if headers in the request meet the CORS configuration requirements when CORS is configured for buckets.

Restrictions:

None

Value range:

The value that complies with the CORS

Default value:

None

Access-Control-Max-Age

Integer

Explanation:

Value of MaxAgeSeconds in the CORS configuration of the server when CORS is configured for buckets.

Restrictions:

None

Value range:

An integer greater than or equal to 0, in seconds

Default value:

3000

Access-Control-Allow-Methods

String

Explanation:

Indicates that methods in the rule are included in the response if Access-Control-Request-Method in the request meets the CORS configuration requirements when CORS is configured for buckets.

Restrictions:

None

Value range:

  • GET
  • PUT
  • HEAD
  • POST
  • DELETE

Default value:

None

Access-Control-Expose-Headers

String

Explanation:

ExposeHeader in the CORS rules of the bucket. It specifies additional headers allowed in the response by a CORS rule, which are used to provide extra information to clients. By default, a browser can access only headers Content-Length and Content-Type. If the browser needs to access other headers, you need to configure them in this parameter.

Restrictions:

Spaces, wildcard characters (*), ampersands (&), colons (:), less-than signs (<), and full-width characters are not allowed.

Value range:

None

Default value:

None

Response Elements

This response contains no elements.

Error Responses

No special error responses are returned. For details about error responses, see Table 2.

Sample Request: Getting CORS Configuration (with No Headers Specified)

HEAD / HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.example.com
Accept: */*
Date: WED, 01 Jul 2015 02:30:25 GMT
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:niCQCuGIZpETKIyx1datxHZyYlk=

Sample Response: Getting CORS Configuration (with No Headers Specified)

HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: BF260000016439C734E0788404623FA8
Content-Type: application/xml
x-obs-storage-class: STANDARD
x-obs-id-2: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCSxwLpq9Hzf3OnaXr+pI/OPLKdrtiQAF
Date: WED, 01 Jul 2015 02:30:25 GMT
x-obs-bucket-location: region
x-obs-version: 3.0
Content-Length: 0

Sample Request: Getting Bucket Metadata and CORS Configuration

HEAD / HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.example.com
Accept: */*
Date: WED, 01 Jul 2015 02:30:25 GMT
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:niCQCuGIZpETKIyx1datxHZyYlk=
Origin:www.example.com
Access-Control-Request-Headers:AllowedHeader_1

Sample Response: Getting Bucket Metadata and CORS Configuration

HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: BF260000016439C734E0788404623FA8
Content-Type: application/xml
x-obs-storage-class: STANDARD
x-obs-id-2: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCSxwLpq9Hzf3OnaXr+pI/OPLKdrtiQAF
Date: WED, 01 Jul 2015 02:30:25 GMT
x-obs-bucket-location: region
Access-Control-Allow-Origin: www.example.com 
Access-Control-Allow-Methods: POST,GET,HEAD,PUT 
Access-Control-Allow-Headers: AllowedHeader_1 
Access-Control-Max-Age: 100 
Access-Control-Expose-Headers: ExposeHeader_1 
x-obs-version: 3.0
Content-Length: 0
Parent topic: Operations on Buckets
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Obtaining Bucket Location
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