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Cloud Object Storage
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    Querying Object Metadata

    Terakhir diperbarui:2024-02-02 17:35:18
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      Overview

      This document provides an overview of APIs and SDK code samples related to querying object metadata.
      API
      Operation
      Description
      Querying object metadata
      Queries the metadata of an object.

      Querying Object Metadata

      Description

      This API is used to query the metadata of an object.

      Sample code

      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

      Parameter
      Description
      Type
      Required
      Bucket
      Bucket name in the format of BucketName-APPID
      String
      Yes
      Region
      Bucket region. For the enumerated values, please see Regions and Access Endpoints.
      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

      Callback function description

      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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