API | Operation | Description |
Querying object metadata | Queries the metadata of an object. |
cos.headObject({Bucket: 'examplebucket-1250000000', /* Your bucket name. Required. */Region: 'COS_REGION', /* Bucket region, such as `ap-beijing`. Required. */Key: '1.jpg', /* Object key stored in the bucket (such as `1.jpg` and `a/b/test.txt`). Required. */}, function(err, data) {console.log(err || data);});
Parameter | Description | Type | Required |
Bucket | Bucket name in the format of BucketName-APPID | String | Yes |
Region | String | Yes | |
Key | Object key (object name), the unique identifier of an object in a bucket. For more information, please see Object Overview. | String | Yes |
IfModifiedSince | Required modification time. Metadata is returned only if the object has been modified after the specified time. Otherwise, 304 is returned. | String | No |
function(err, data) { ... }
Parameter | Description | Type |
err | Error code, which is returned when an error (network error or service error) occurs. If the request is successful, this parameter is empty. For more information, please see Error Codes. | Object |
- statusCode | HTTP status code, such as 200 , 403 , and 404 . | Number |
- headers | Headers. | Object |
data | Content returned when the request is successful. If the request fails, this parameter is empty. | Object |
- statusCode | HTTP status code, such as 200 and 304 . 304 is returned if no modification is made after the specified time. | Number |
- headers | Headers. | Object |
- x-cos-object-type | Whether an object is appendable. Enumerated values: normal , appendable . The default value normal is not displayed. | String |
- x-cos-storage-class | Storage class of the object, such as STANDARD (default), STANDARD_IA , ARCHIVE , and DEEP_ARCHIVE . For more information, please see Storage Class Overview. Note that STANDARD is not displayed if returned. | String |
- x-cos-meta-* | User-defined metadata. | String |
- NotModified | Whether an object hasn’t been modified after the specified time. | Boolean |
- ETag | MD5 checksum of the object. The value of ETag can be used to check whether the object was corrupted during the upload. Example: "09cba091df696af91549de27b8e7d0f6" Note that double quotation marks are required at the beginning and the end. | String |
- VersionId | Version ID of the uploaded object if versioning is enabled for its bucket. If versioning is not enabled, this parameter is not returned. | String |
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