HEAD Bucket¶
After being granted READ permission for a bucket, you can use this operation to query whether the bucket exists.
Request Syntax¶
HEAD / HTTP/1.1
User-Agent: agent
Host: bucketname.obs.example.com
Accept: */*
Date: date
Authorization: authorization
Request Parameters¶
This request involves no parameters.
Request Headers¶
This request uses common headers. For details about common request headers, see section Common Request Headers.
If you want to obtain CORS configuration information, you must use the headers in Table 1.
Header | Description | Remarks |
|---|---|---|
Origin | Indicates an origin specified by a pre-request. Generally, it is a domain name. Type: String | Mandatory |
Access-Control-Request-Headers | Indicates the HTTP headers of a request. The request can use multiple HTTP headers. Type: String | Optional |
x-amz-security-token | Header field used to identify the request of a federated user. When the federal authentication function is enabled, users sending such requests are identified as federated users. Type: string | Optional. This parameter must be carried in the request sent by federated users. |
Request Elements¶
This request involves no elements.
Response Syntax¶
HTTP/1.1 status_code
Server: Server Name
x-amz-request-id: request id
x-reserved: amazon, aws and amazon web services are trademarks or registered trademarks of Amazon Technologies, Inc
x-amz-bucket-region: region name
Content-Type: */*
x-obs-version: version
x-default-storage-class: staorage class
x-amz-id-2: id
Date: date
Content-Length: length
Response Headers¶
This response uses common headers. For details about common response headers, see section Common Response Headers.
In addition to common headers, when CORS is configured for buckets, you can use the response headers in Table 2.
Header | Description |
|---|---|
Access-Control-Allow-Origin | If Origin in the request meets the CORS configuration requirements, Origin is included in the response. Type: String |
Access-Control-Allow-Headers | If headers in the request meet the CORS configuration requirements, headers are included in the response. Type: String |
Access-Control-Max-Age | Indicates MaxAgeSeconds in the CORS configuration of a server. Type: Integer |
Access-Control-Allow-Methods | If Access-Control-Request-Method in the request meets the CORS configuration requirements, methods in the rule are included in the response. Type: String Valid values: GET, PUT, HEAD, POST, and DELETE |
Access-Control-Expose-Headers | Indicates ExposeHeader in the CORS configuration of a server. Type: String |
x-amz-bucket-region | Indicates the region of the bucket. Type: String |
x-default-storage-class | Indicates the default storage class of the current bucket. There are three storage classes: STANDARD (OBS Standard), STANDARD_IA (OBS Warm), and GLACIER (OBS Cold). Type: String |
Response Elements¶
This response involves no elements.
Error Responses¶
No special error responses are returned. For details about error responses, see Table 1.
Sample Request¶
HEAD / HTTP/1.1
User-Agent: Jakarta Commons-HttpClient/3.1
Host: bucketname.obs.example.com
Accept: */*
Date: Sun, 26 Sep 2010 09:16:00 GMT
Authorization: AWS 04RZT432N80TGDF2Y2G2:JUtd9kkJFjbKbkP9f6T/tAxozYY=
Sample Response¶
HTTP/1.1 200 OK
Server: OBS
x-amz-request-id: 367CB63A2F283044981285492719060
x-reserved: amazon, aws and amazon web services are trademarks or registered trademarks of Amazon Technologies, Inc
x-amz-bucket-region: R1
Content-Type: application/xml
x-obs-version: 3.0
x-default-storage-class: STANDARD
x-amz-id-2: MzY3Q0I2M0EyRjI4MzA0NDk4MTI4NTQ5MjcxOTA2MEFBQUFBQUFBYmJiYmJiYmJD
Date: Sun, 26 Sep 2010 09:18:36 GMT
Content-Length: 0
Sample Request (Getting Bucket Metadata and CORS Configuration when CORS is properly configured)¶
HEAD / HTTP/1.1
User-Agent: curl/7.19.0 (x86_64-suse-linux-gnu) libcurl/7.19.0 OpenSSL/0.9.8{ zlib/1.2.3 libidn/1.10
Host: bucketname.obs.example.com
Accept: */*
Date: Tue, 28 Apr 2015 13:47:30 +0000
Authorization: AWS D13E0C94E722DD69423C:1UL75oi0bFRpJlgZMfvh4lUyjBs=
Origin:www.example.com
Access-Control-Request-Headers:AllowedHeader_1
Sample Response (Getting Bucket Metadata and CORS Configuration when CORS is properly configured)¶
HTTP/1.1 200 OK
x-amz-request-id: BC4C45F57B0DED38D006D5F8FEB738C4
x-reserved: amazon, aws and amazon web services are trademarks or registered trademarks of Amazon Technologies, Inc
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-amz-bucket-region: R1
Content-Type: text/xml
x-obs-version: 3.0
x-default-storage-class: STANDARD
x-amz-id-2: YkFlH3FTA2Tf/lIc2XiyuICp/EUqpVI4j1/g5hlatg75TTZdERSCYliqitChspgA
Date: Tue, 28 Apr 2015 13:47:30 GMT
Content-Length: 0