- Release Notes
- Product Introduction
- Purchase Guide
- Getting Started
- Console Guide
- Console Overview
- Bucket Management
- Bucket Overview
- Creating Buckets
- Deleting Buckets
- Querying Buckets
- Empty Buckets
- Setting Access Permission
- Setting Bucket Encryption
- Setting Hotlink Protection
- Setting Origin-Pull
- Setting Cross-Origin Access
- Setting Versioning
- Setting up a Static Website
- Setting Lifecycle
- Setting Logging
- Accessing Bucket List Using Sub-Account
- Adding Bucket Policies
- Setting INTELLIGENT TIERING
- Enabling Inventory
- Domain Name Management
- Setting Bucket Tags
- Setting Cross-Bucket Replication
- Enabling Global Acceleration
- Object Management
- Uploading Objects
- Downloading Objects
- Copying Objects
- Viewing Object Information
- Searching for Objects
- Sorting and Filtering Objects
- Direct Upload Archiving
- Modifying Storage Class
- Deleting File Fragments
- Setting Object Access Permission
- Setting Object Encryption
- Custom Headers
- Deleting Objects
- Restoring an Archived Object
- Folder Management
- Data Extraction
- Setting Object Tags
- Batch Operation
- Monitoring Reports
- Data Processing
- Application Integration
- User Tools
- Best Practice
- Overview
- Access Control and Permission Management
- ACL Practices
- Cloud Access Management Practices
- Granting Sub-accounts Access to COS
- Cases of Permission Setting
- Working with COS API Access Policies
- Temporary Key Security Guide for Frontend Direct Upload to COS
- Generating and Using Temporary Keys
- Grant Sub-account Permissions to Pull Tag List
- Granting Sub-account Under One Root Account Permission to Manipulate Buckets Under Another Root Account
- Performance Optimization
- Data Migration
- Accessing COS Using the AWS S3 SDK
- Data Disaster Recovery and Backup
- Direct Data Upload
- Domain Name Management Practice
- Data Security
- Data Verification
- Big Data Practice
- Using COS in the Third-party Applications
- Introduction to COS Data Security Solution
- Developer Guide
- Creating Request
- Bucket
- Object
- Data Management
- Data Disaster Recovery
- Data Security
- Cloud Access Management (CAM)
- Batch Processing
- Monitoring and Alarms
- Global Acceleration
- Data Processing
- Troubleshooting
- API Documentation
- Introduction
- Common Request Headers
- Common Response Headers
- Error Codes
- Request Signature
- Operation List
- Service APIs
- Bucket APIs
- Basic Operations
- Access Control List (acl)
- Cross-Origin Resource Sharing (cors)
- Lifecycle
- Bucket Policy (policy)
- Hotlink Protection (referer)
- Tag (tagging)
- Static Website (website)
- Intelligent Tiering
- Bucket inventory(inventory)
- Versioning
- Cross-Bucket Replication（replication）
- Log Management(logging)
- Global Acceleration (Accelerate)
- Bucket Encryption (encryption)
- Object APIs
- Batch Operation APIs
- Data Processing APIs
- SDK Documentation
- SDK Overview
- Preparations
- Android SDK
- Object Operations
- Uploading and Copying Objects
- Downloading Objects
- Listing Objects
- Deleting an Object
- Restoring an Archived Object
- Querying Object Metadata
- Generating a Pre-signed Link
- Configuring Preflight Requests for Cross-origin Access
- Moving an Object
- Server-Side Encryption
- Single-Connection Bandwidth Limit
- Extracting Object Content
- Getting Started
- Quick Experience
- Bucket Operations
- Remote Disaster Recovery
- Data Management
- Cloud Access Management
- Setting Custom Headers
- Setting Access Domain Names
- Image Processing
- Troubleshooting
- Object Operations
- C SDK
- C++ SDK
- .NET(C#) SDK
- Getting Started
- Bucket Operations
- Object Operations
- Uploading and Copying Objects
- Moving an Object
- Downloading Objects
- Listing Objects
- Deleting Objects
- Restoring Archived Objects
- Querying Object Metadata
- Generating Pre-Signed URLs
- Configuring Preflight Requests for Cross-Origin Access
- Server-Side Encryption
- Single-Connection Bandwidth Limit
- Extracting Object Content
- Cross-Region Disaster Recovery
- Data Management
- Cloud Access Management
- Image Processing
- Setting Custom Headers
- Setting Access Endpoints
- Troubleshooting
- Go SDK
- iOS SDK
- Java SDK
- JavaScript SDK
- Node.js SDK
- PHP SDK
- Python SDK
- Mini Program SDK
- Error Codes
- FAQs
- Service Level Agreement
- Glossary
- Release Notes
- Product Introduction
- Purchase Guide
- Getting Started
- Console Guide
- Console Overview
- Bucket Management
- Bucket Overview
- Creating Buckets
- Deleting Buckets
- Querying Buckets
- Empty Buckets
- Setting Access Permission
- Setting Bucket Encryption
- Setting Hotlink Protection
- Setting Origin-Pull
- Setting Cross-Origin Access
- Setting Versioning
- Setting up a Static Website
- Setting Lifecycle
- Setting Logging
- Accessing Bucket List Using Sub-Account
- Adding Bucket Policies
- Setting INTELLIGENT TIERING
- Enabling Inventory
- Domain Name Management
- Setting Bucket Tags
- Setting Cross-Bucket Replication
- Enabling Global Acceleration
- Object Management
- Uploading Objects
- Downloading Objects
- Copying Objects
- Viewing Object Information
- Searching for Objects
- Sorting and Filtering Objects
- Direct Upload Archiving
- Modifying Storage Class
- Deleting File Fragments
- Setting Object Access Permission
- Setting Object Encryption
- Custom Headers
- Deleting Objects
- Restoring an Archived Object
- Folder Management
- Data Extraction
- Setting Object Tags
- Batch Operation
- Monitoring Reports
- Data Processing
- Application Integration
- User Tools
- Best Practice
- Overview
- Access Control and Permission Management
- ACL Practices
- Cloud Access Management Practices
- Granting Sub-accounts Access to COS
- Cases of Permission Setting
- Working with COS API Access Policies
- Temporary Key Security Guide for Frontend Direct Upload to COS
- Generating and Using Temporary Keys
- Grant Sub-account Permissions to Pull Tag List
- Granting Sub-account Under One Root Account Permission to Manipulate Buckets Under Another Root Account
- Performance Optimization
- Data Migration
- Accessing COS Using the AWS S3 SDK
- Data Disaster Recovery and Backup
- Direct Data Upload
- Domain Name Management Practice
- Data Security
- Data Verification
- Big Data Practice
- Using COS in the Third-party Applications
- Introduction to COS Data Security Solution
- Developer Guide
- Creating Request
- Bucket
- Object
- Data Management
- Data Disaster Recovery
- Data Security
- Cloud Access Management (CAM)
- Batch Processing
- Monitoring and Alarms
- Global Acceleration
- Data Processing
- Troubleshooting
- API Documentation
- Introduction
- Common Request Headers
- Common Response Headers
- Error Codes
- Request Signature
- Operation List
- Service APIs
- Bucket APIs
- Basic Operations
- Access Control List (acl)
- Cross-Origin Resource Sharing (cors)
- Lifecycle
- Bucket Policy (policy)
- Hotlink Protection (referer)
- Tag (tagging)
- Static Website (website)
- Intelligent Tiering
- Bucket inventory(inventory)
- Versioning
- Cross-Bucket Replication（replication）
- Log Management(logging)
- Global Acceleration (Accelerate)
- Bucket Encryption (encryption)
- Object APIs
- Batch Operation APIs
- Data Processing APIs
- SDK Documentation
- SDK Overview
- Preparations
- Android SDK
- Object Operations
- Uploading and Copying Objects
- Downloading Objects
- Listing Objects
- Deleting an Object
- Restoring an Archived Object
- Querying Object Metadata
- Generating a Pre-signed Link
- Configuring Preflight Requests for Cross-origin Access
- Moving an Object
- Server-Side Encryption
- Single-Connection Bandwidth Limit
- Extracting Object Content
- Getting Started
- Quick Experience
- Bucket Operations
- Remote Disaster Recovery
- Data Management
- Cloud Access Management
- Setting Custom Headers
- Setting Access Domain Names
- Image Processing
- Troubleshooting
- Object Operations
- C SDK
- C++ SDK
- .NET(C#) SDK
- Getting Started
- Bucket Operations
- Object Operations
- Uploading and Copying Objects
- Moving an Object
- Downloading Objects
- Listing Objects
- Deleting Objects
- Restoring Archived Objects
- Querying Object Metadata
- Generating Pre-Signed URLs
- Configuring Preflight Requests for Cross-Origin Access
- Server-Side Encryption
- Single-Connection Bandwidth Limit
- Extracting Object Content
- Cross-Region Disaster Recovery
- Data Management
- Cloud Access Management
- Image Processing
- Setting Custom Headers
- Setting Access Endpoints
- Troubleshooting
- Go SDK
- iOS SDK
- Java SDK
- JavaScript SDK
- Node.js SDK
- PHP SDK
- Python SDK
- Mini Program SDK
- Error Codes
- FAQs
- Service Level Agreement
- Glossary
Introduction
If an SDK API call to request COS service fails, an error message will be returned in the callback.
Sample error
cos.headBucket({
Bucket: 'examplebucket-1250000000',
Region: 'COS_REGION',
}, function(err, data) {
if (err) {
console.log(err.error);
}
});Client Exceptions
| Parameter Name | Description | Type |
|---|---|---|
| err | Object returned when an error (network error or service error) occurs. If the request is successful, this is null. For more information, see Error Codes | Object |
| - error | Error message for the request | Object/String |
Server exceptions
| Parameter Name | Description | Type |
|---|---|---|
| err | Object returned when an error, a network error or service error, occurs. If the request is successful, this will be empty. For more information, see Error Codes | Object |
| - statusCode | HTTP status code returned by the request, such as `200`, `403`, and `404` | Number |
| - headers | Headers returned by the request | Object |
| - error | Error message for the request | Object/String |
| - - Code | Error code returned in the body when the request fails. For more information, see Error Codes | String |
| - - Message | Error message returned in the body when the request fails. For more information, see Error Codes | String |
| - - RequestId | The unique ID of the request in the server request log that can be submitted in a ticket for troubleshooting | String |
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