Torch Object Storage
Torch Object Storage
Torch Object Storage
Document
What's New
Announcements
Billing
Billable items
Billing method
Getting Started
User Guide
Working with buckets
Basic configurations
Managing lifecycle
Back-to-origin rules
Event notification
Intelligent Tiering
Permissions
Domain management
Fault tolerance and disaster recovery
Cross-region replication
Same-region replication
Data redundancy
Image processing
ObjectSet
Working with objects
Managing folders
Monitoring and alerting
Metric monitoring
Access control
Bucket policies
Common configuration scenarios
Authorizing IAM users of the current account
Authorizing other accounts
Managing access via tools and SDKs
Managing public read access
Data security
Access points
Multi-region access points (MRAP)
Single-region access points (SRAP)
Converged access points (CAP)
DevMind
TOS accelerator
SenseFlow
TOS Agent
Data processing
Basic concepts
Image processing
Media processing
Document preview
Task processing
Data subscription
Flow control management
Quality of Service (QoS) policies
Hierarchical namespace (HNS)
User guide
Tool reference
Best practices
TOS Vectors
User guide
API reference
Vector bucket
Vector index
SDK reference
Python-Vectors
Vector bucket
Vector index
Java-Vectors
Vector bucket
Vector index
Node.js-Vectors
Vector bucket
Vector index
Tool Guide
tosutil
Common commands
Upload, download, and copy objects
Share objects
Auxiliary commands
Common examples
TOS Browser
FSX
FSX best practices
TOS PyTorch Connector
tosfsspec
API Reference
Signature Mechanism
The header contains a signature
Bucket
Basic Bucket Operations
Bucket Lifecycle
Access Monitor
Bucket ACL
Bucket CORS
Bucket Policy
Back-to-origin Rules
Bucket Replication
Versioning
Static Website
Event Notification
Custom Domain
Server-side encryption
Transfer Acceleration
Data Processing
Image processing
Media processing
Video transcoding
Audio transcoding
video to GIF
Document preview
File decompression
Log Storage
Retention Policy
Requester pays
TLS version
Object
Basic Object Operations
Object ACL
Fetch Object
Symbolic Link
WORM object
Multipart Upload
SDK Reference
Java
Pre-signing Mechanism
Bucket Interface
Basic Bucket Interface
Manage Bucket Configuration
Object Interface
Upload Object
Download Object
Upload and Download Speed Limit
Copy Object
List Object
Data Processing
Image Processing
Video Processing
Audio Processing
Log Configuration
Hierarchical Namespace
Bucket base interface
Introduction to Typical Scenes
Python
Data processing
Pre-signature mechanism
Bucket interface
Basic bucket interface
Manage bucket configuration
Object interface
Upload object
Download object
Copy object
List objects
Introduction to typical scenes
C
Object Interface
Upload object
C++
Pre-signature Mechanism
Bucket Interface
Basic Bucket Interface
Manage Bucket Configuration
Object Interface
Upload Object
Download Object
Copy Object
List Objects
Data Processing
Go
Object Interface
Upload Object
Download Object
Copy Object
List Objects
Manage Objects
Bucket Interface
Manage Bucket Configuration
Data Processing
Log Configuration
Introduction to Typical Scenes
Pre-signature Mechanism
Node.js
Pre-signature Mechanism
Bucket Interface
Basic Bucket Interface
Manage Bucket Configuration
Object Interface
Upload object
Download object
Copy object
List objects
Data Processing
Image Processing
Introduction to Typical Scenes
Browser.js
Pre-signature Mechanism
Upload Object
Download Object
Copy Object
List Objects
Manage Objects
Data Processing
.NET
Bucket Interface
Object Interface
Upload Object
Download Object
List Objects
Introduction to Typical Scenes
PHP
Bucket Interface
Object Interface
Download Object
Data Processing
Exception Handling
Android
Bucket Interface
Object Interface
Upload Object
Download Object
Exception Handling
iOS
Bucket Interface
Object Interface
Upload Object
Download Object
Harmony
Pre-signature Mechanism
Bucket Interface
Object Interface
Upload Object
Download Object
List Objects v2
Introduction to Typical Scenarios
Rust
Pre-signing mechanism
Bucket interface
Basic bucket operations
Lifecycle rules
Bucket ACLs
Cross-origin resource sharing
Bucket inventory
Back-to-origin rules
Bucket replication
Static website hosting
Event notification
Custom domain
Server-side encryption
Object interface
Basic operation
Access control
Error Codes
01-SERVICE_ERROR
02-AUTH
03-ACCESS_CONTROL
04-QOS
05-REQUEST
06-BUCKET
07-LIFECYCLE
08-ACL
09-CORS
10-POLICY
11-MIRROR
12-REPLICATION
13-WEBSITE
14-NOTIFICATION
15-ENCRYPT
16-CUSTOMDOMAIN
17-OBJECT
18-TAG
19-MULTIPART
20-STORAGE_CLASS
21-CALLBACK
22-DATA_PROCESS
23-BATCH
24-STORAGE_LENS
25-INVENTORY
26-DIRECTORY_BUCKET
FAQ
Best Practices
AIGC-Doubao LLMs
Accessing TOS with third-party tools
Granting temporary access
Data migration
Data processing
Checking data integrity
Performance optimization
- Documentation
Torch Object StorageSDK ReferenceHarmonyObject InterfaceManage ObjectsManaged Object Metadata (Harmony SDK)
Copy page
Download PDFManage Objects
Managed Object Metadata (Harmony SDK)
Copy pageDownload PDFManaged Object Metadata (Harmony SDK)
Object metadata describes the properties of an object and includes both HTTP standard attributes (HTTP Header) and user-defined metadata (User Meta).
Precautions
- Only the object owner has permission to set object metadata.
- When setting user-defined metadata, the Key (which uses English letters) supports only lowercase letters and does not allow spaces or other special characters.
Parameter Description
The TOS Harmony SDK enables the addition and modification of metadata for objects that have already been uploaded. TOS supports the use of the following seven request headers to modify object metadata. When downloading an object or performing a HEAD request, these values are set in the HTTP header fields and returned to the client. The request headers are as follows:
Content-Type | Object Type. |
Content-Type | Object Type. |
Cache-Control | Specify the web page's caching behavior when this object is downloaded. |
Expires | Cache expiration time as defined in RFC2616. |
Content-Disposition | Name assigned to the object upon download. |
Content-Encoding | Content encoding type applied when the object is downloaded. |
Content-Language | Content language format when the object is downloaded. |
x-tos-meta-* | Metadata information set when configuring the meta field using the SDK. When this object is queried, the metadata will be included in the Header of the response message. |
Sample Code
Setting Metadata Information During Standard Upload
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos_harmonyos_sdk';
const client = new TosClient({
accessKeyId: "Provide your ak",
accessKeySecret: "Provide your sk",
securityToken: 'Provide your securityToken',
region: "Provide your region",
endpoint: "Provide your endpoint",
});
function handleError(error) {
if (error instanceof TosClientError) {
console.log('Client Err Name:', error.name);
console.log('Client Err Msg:', error.message);
console.log('Client Err Stack:', error.stack);
} else if (error instanceof TosServerError) {
console.log('Request ID:', error.requestId);
console.log('Response Status Code:', error.statusCode);
console.log('Response Status Code:', error.statusCode);
console.log('Response Header:', error.headers);
console.log('Response Err Code:', error.code);
console.log('Response Err Msg:', error.message);
} else {
console.log('unexpected exception, message: ', error);
}
}
async function main() {
const meta: Record<string, string> = {};
meta.key = 'value';
try {
const res = await client.putObject({
Bucket: bucketName,
Key: objectKey,
Content: buffer.from('Hello TOS').buffer,
Meta: meta,
ContentType: 'text/html',
ContentLanguage: 'zh-cn',
CacheControl: 'no-store',
Expires: new Date('2028/01/01'),
ContentDisposition: 'example.png',
ContentEncoding: 'deflate',
});
console.log('putObject Request ID:', res.RequestId);
} catch (error) {
handleError(error);
}
}
main();
Configuring Metadata for Multipart Uploads
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos_harmonyos_sdk';
const client = new TosClient({
accessKeyId: "Provide your ak",
accessKeySecret: "Provide your sk",
securityToken: 'Provide your securityToken',
region: "Provide your region",
endpoint: "Provide your endpoint",
});
function handleError(error) {
if (error instanceof TosClientError) {
console.log('Client Err Name:', error.name);
console.log('Client Err Msg:', error.message);
console.log('Client Err Stack:', error.stack);
} else if (error instanceof TosServerError) {
console.log('Request ID:', error.requestId);
console.log('Response Status Code:', error.statusCode);
console.log('Response Status Code:', error.statusCode);
console.log('Response Header:', error.headers);
console.log('Response Err Code:', error.code);
console.log('Response Err Msg:', error.message);
} else {
console.log('unexpected exception, message: ', error);
}
}
async function main() {
try {
const bucketName = 'harmony-sdk-test-bucket';
const objectName = 'example_dir/multipartExample';
const filePath = './example_dir/multipartExample';
const meta: Record<string, string> = {};
meta.key = 'value';
const res = await client.createMultipartUpload({
Bucket: bucketName,
Key: objectName,
Meta: meta,
ContentType: 'text/html',
ContentLanguage: 'zh-cn',
CacheControl: 'no-store',
Expires: new Date('2028/01/01'),
ContentDisposition: 'example.png',
ContentEncoding: 'deflate',
});
console.log('CreateMultipartUploadV2 Upload ID:', res.UploadId);
const stats = await fs.statSync(filePath);
const totalSize = stats.size;
const partSize = 5 * 1024 * 1024;
let offset = 0;
let partNumber = 1;
const partsInfo: UploadedPart[] = [];
while (offset < totalSize) {
const uploadResult = await client.uploadPart({
Bucket: bucketName,
Key: objectName,
PartNumber: partNumber,
UploadID: res.UploadId,
Content: fs.createReadStream(filePath, {
start: offset,
end: offset + partSize - 1,
}),
});
const eTag = uploadResult.ETag;
console.log(`partNumber${partNumber} Etag:`, eTag);
partsInfo.push(new UploadedPart(partNumber, eTag));
partNumber++;
offset += partSize;
}
console.log('parts information', partsInfo);
const completeRes = await client.completeMultipartUpload({
Bucket: bucketName,
Key: objectName,
UploadID: res.UploadId,
Parts: partsInfo,
});
console.log('result status:', completeRes.StatusCode);
} catch (error) {
handleError(error);
}
}
main();
Set object metadata information using SetObjectMeta.
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos_harmonyos_sdk';
const client = new TosClient({
accessKeyId: "Provide your ak",
accessKeySecret: "Provide your sk",
securityToken: 'Provide your securityToken',
region: "Provide your region",
endpoint: "Provide your endpoint",
});
function handleError(error) {
if (error instanceof TosClientError) {
console.log('Client Err Name:', error.name);
console.log('Client Err Msg:', error.message);
console.log('Client Err Stack:', error.stack);
} else if (error instanceof TosServerError) {
console.log('Request ID:', error.requestId);
console.log('Response Status Code:', error.statusCode);
console.log('Response Status Code:', error.statusCode);
console.log('Response Header:', error.headers);
console.log('Response Err Code:', error.code);
console.log('Response Err Msg:', error.message);
} else {
console.log('unexpected exception, message: ', error);
}
}
async function main() {
const meta: Record<string, string> = {};
meta.key = 'value';
try {
const res = await client.setObjectMeta({
Bucket: bucketName,
Key: objectKey,
Meta: meta,
ContentType: 'text/html',
ContentLanguage: 'zh-cn',
CacheControl: 'no-store',
Expires: new Date('2028/01/01'),
ContentDisposition: 'example.png',
ContentEncoding: 'deflate',
});
console.log('putObject Request ID:', res.RequestId);
} catch (error) {
handleError(error);
}
}
main();
Query Object Metadata Information (Determine Object Existence)
warning
Before obtaining object metadata, you must have the tos:GetObject permission. For specific instructions, refer to IAM Policy Overview.
import { TosClient, TosClientError, TosServerError } from '@volcengine/tos_harmonyos_sdk';
const client = new TosClient({
accessKeyId: "Provide your ak",
accessKeySecret: "Provide your sk",
securityToken: 'Provide your securityToken',
region: "Provide your region",
endpoint: "Provide your endpoint",
});
function handleError(error) {
if (error instanceof TosClientError) {
console.log('Client Err Name:', error.name);
console.log('Client Err Msg:', error.message);
console.log('Client Err Stack:', error.stack);
} else if (error instanceof TosServerError) {
console.log('Request ID:', error.requestId);
console.log('Response Status Code:', error.statusCode);
console.log('Response Status Code:', error.statusCode);
console.log('Response Header:', error.headers);
console.log('Response Err Code:', error.code);
console.log('Response Err Msg:', error.message);
} else {
console.log('unexpected exception, message: ', error);
}
}
const bucketName = 'harmonyos-sdk-test-bucket';
const objectKey = 'example_dir/example.txt';
async function main() {
try {
const res = await client.headObject({
Bucket: bucketName,
Key: objectKey,
});
console.log('headObject Request ID:', res.RequestId);
console.log('headObject Response ContentLanguage:', res.ContentLength);
console.log('headObject Response ContentDisposition:', res.ContentDisposition);
console.log('headObject Response ContentEncoding:', res.ContentEncoding);
console.log('headObject Response CacheControl:', res.CacheControl);
console.log('headObject Response ContentType:', res.ContentType);
console.log('headObject Response Expires:', res.Expires);
} catch (error) {
handleError(error);
}
}
main();
Relevant Documentation
Last updated: 2025.09.26 19:05:15
All rights reserved © Beijing Volcano Engine Technology Co., Ltd2024
