Modifying Object Metadata

Functions

This operation modifies, deletes, or adds metadata to uploaded objects in a bucket.

Request Syntax

    
         PUT /ObjectName?metadata HTTP/1.1 
Host: bucketname.obs.region.myhuaweicloud.eu
Content-Type: application/xml 
Content-Length: length
Authorization: authorization
Date: date
<Optional Additional Header> 
<object Content>

Request Parameters

**Table 1** Request parameters
Parameter	Description	Mandatory
versionId	Object version ID Type: string	No

Request Headers

OBS supports the six HTTP request headers: Cache-Control, Expires, Content-Encoding, Content-Disposition, Content-Type, and Content-Language. It saves these header values in the metadata of the object. When the object is downloaded or queried, the saved values are set for corresponding HTTP headers and returned to the client.

**Table 2** Request headers
Header	Description	Mandatory
x-obs-metadata-directive	Metadata operation indicator. The value can be REPLACE_NEW or REPLACE. REPLACE_NEW: The metadata that has an existing value is replaced. A value is assigned to the metadata that does not have a value. The metadata that is not specified remains unchanged. (Note: a header with custom metadata is replaced.) REPLACE: Use the header field carried in the current request to replace the original metadata. The metadata that is not specified (except x-obs-storage-class) will be deleted. Type: string	Yes
Cache-Control	Specifies the cache behavior of the web page when the object is downloaded. Type: string	No
Content-Disposition	Specifies the name of the object when it is downloaded. Type: string	No
Content-Encoding	Specifies the content encoding format when an object is being downloaded. Type: string	No
Content-Language	Specifies the content language format when an object is downloaded. Type: string	No
Content-Type	Object file type. Type: string	No
Expires	Specifies the cache expiration time of the web page when the object is downloaded. Type: string	No
x-obs-website-redirect-location	When the bucket is configured with the website redirection, the request for obtaining the object can be redirected to another object or an external URL in the bucket. In the following example, the request header sets the redirection to an object (anotherPage.html) in the same bucket: x-obs-website-redirect-location:/anotherPage.html In the following example, the request header sets the object redirection to an external URL: x-obs-website-redirect-location:http://www.example.com/ Type: string Constraint: The value must be prefixed by a slash (/), http://, or https://. The length of the value cannot exceed 2 KB.	No
x-obs-storage-class	Specifies the storage class of an object. Type: string Storage class options: STANDARD (Standard), WARM (Infrequent Access), COLD (Archive). These values are case sensitive. Example: x-obs-storage-class: STANDARD	No
x-obs-meta-*	A message header starting with x-obs-meta- can be added to a request to add custom metadata for object management. Custom metadata will be returned in the response header when you retrieve or query the metadata of the object. For details, see User-Defined Object Metadata. Type: string Example: x-obs-meta-test: test metadata	No
x-obs-expires	Specifies when an object expires. It is measured in days. Once the object expires, it is automatically deleted. Type: integer Example: x-obs-expires:3	No

Request Elements

This request involves no elements.

Response Syntax

    
         HTTP/1.1 status_code
Date: date
Content-Length: length
Etag: etag
Last-Modified: time

Response Headers

**Table 3** Additional response headers
Header	Description
x-obs-metadata-directive	Metadata operation indicator. The value can be REPLACE_NEW or REPLACE. Type: string
Cache-Control	Specifies the cache behavior of the web page when the object is downloaded. If a request carries this header field, the response message must contain this header field. Type: string
Content-Disposition	Specifies the name of the object when it is downloaded. If a request carries this header field, the response message must contain this header field. Type: string
Content-Encoding	Specifies the content encoding format when an object is being downloaded. If a request carries this header field, the response message must contain this header field. Type: string
Content-Language	Specifies the content language format when an object is downloaded. If a request carries this header field, the response message must contain this header field. Type: string
Expires	Specifies the cache expiration time of the web page when the object is downloaded. If a request carries this header field, the response message must contain this header field. Type: string
x-obs-website-redirect-location	When the bucket is configured with the website redirection, the request for obtaining the object can be redirected to another object or an external URL in the bucket. If a request carries this header field, the response message must contain this header field. Type: string
x-obs-storage-class	Specifies the storage class of an object. If a request carries this header field, the response message must contain this header field. Type: string
x-obs-meta-*	Custom metadata is used to manage objects in a customized manner. If a request carries this header field, the response message must contain this header field. Type: string
x-obs-expires	Specifies when an object expires. It is measured in days. If a request carries this header field, the response message must contain this header field. Type: integer

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: Adding Metadata for an Object

Add the following metadata to the object: Content-Type:application/zip and x-obs-meta-test:meta.

    
         PUT /object?metadata HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.myhuaweicloud.eu
Accept: */*
Date: WED, 01 Jul 2015 14:24:33 GMT
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:NxtSMS0jaVxlLnxlO9awaMTn47s=
x-obs-metadata-directive:REPLACE_NEW
Content-Type:application/zip
x-obs-meta-test:meta

Sample Response: Adding Metadata for an Object

    
         HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: 8DF400000163D3E4BB5905C41B6E65B6
Accept-Ranges: bytes
x-obs-id-2: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCSD3nAiTaBoeyt9oHp9vTYtXnLDmwV6D
Date: WED, 01 Jul 2015 04:19:21 GMT
Content-Length: 0
x-obs-metadata-directive:REPLACE_NEW
x-obs-meta-test:meta

Sample Request: Editing Metadata of an Object

If metadata x-obs-meta-test:testmeta exists in the object and the value of x-obs-storage-class is WARM, change the metadata x-obs-meta-test of the object to newmeta and change x-obs-storage-class to COLD.

    
         PUT /object?metadata HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.myhuaweicloud.eu
Accept: */*
Date: WED, 01 Jul 2015 14:24:33 GMT
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:NxtSMS0jaVxlLnxlO9awaMTn47s=
x-obs-metadata-directive:REPLACE_NEW
x-obs-meta-test:newmeta
x-obs-storage-class:COLD

Sample Response: Editing Metadata of an Object

    
         HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: 8DF400000163D3E4BB5905C41B6E65B6
Accept-Ranges: bytes
x-obs-id-2: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCSD3nAiTaBoeyt9oHp9vTYtXnLDmwV6D
Date: WED, 01 Jul 2015 04:19:21 GMT
Content-Length: 0
x-obs-metadata-directive:REPLACE_NEW
x-obs-meta-test:newmeta
x-obs-storage-class:COLD

Sample Request: Deleting Metadata of an Object

Metadata x-obs-meta-test:newmeta and Content-Type:application/zip exist in the object, and delete x-obs-meta-test.

    
         PUT /object?metadata HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.myhuaweicloud.eu
Accept: */*
Date: WED, 01 Jul 2015 14:24:33 GMT
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:NxtSMS0jaVxlLnxlO9awaMTn47s=
x-obs-metadata-directive:REPLACE
Content-Type:application/zip

Sample Response: Deleting Metadata of an Object

    
         HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: 8DF400000163D3E4BB5905C41B6E65B6
Accept-Ranges: bytes
x-obs-id-2: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCSD3nAiTaBoeyt9oHp9vTYtXnLDmwV6D
Date: WED, 01 Jul 2015 04:19:21 GMT
Content-Length: 0
x-obs-metadata-directive:REPLACE