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Object Storage Service:PutPublicAccessBlock

Last Updated:Jun 02, 2026

Enables Block Public Access for OSS resources.

Usage notes

  • An Alibaba Cloud account can enable Block Public Access for OSS by default. To use a RAM user or STS credentials, you must have the oss:PutPublicAccessBlock permission. For more information, see Common examples of RAM policies.

  • When Block Public Access is enabled, existing public access permissions are ignored and public access permissions cannot be configured. When disabled, existing permissions take effect and public access permissions can be configured.

Request syntax

PUT /?publicAccessBlock HTTP/1.1
Date: GMT Date
Content-Length: ContentLength
Content-Type: application/xml
Host: oss-cn-hangzhou.aliyuncs.com
Authorization: SignatureValue

<?xml version="1.0" encoding="UTF-8"?>
<PublicAccessBlockConfiguration>
  <BlockPublicAccess>true</BlockPublicAccess>
</PublicAccessBlockConfiguration>

Request headers

This operation uses only common request headers. For more information, see Common request headers.

Request elements

Element

Type

Required

Example

Description

PublicAccessBlockConfiguration

Container

Yes

N/A

The container for Block Public Access configurations.

Parent nodes: none

Child nodes: BlockPublicAccess

BlockPublicAccess

Boolean

No

true

Whether to enable Block Public Access.

  • true: enables Block Public Access.

  • false (default): disables Block Public Access.

Response headers

This operation returns only common response headers. For more information, see Common response headers.

Examples

  • Sample request

    PUT /?publicAccessBlock HTTP/1.1
    Date: Mon, 19 Feb 2024 08:40:17 GMT
    Content-Length: 148
    Content-Type: application/xml
    Host: oss-cn-hangzhou.aliyuncs.com
    Authorization: OSS4-HMAC-SHA256 Credential=LTAI********************/20250417/cn-hangzhou/oss/aliyun_v4_request,AdditionalHeaders=content-length,Signature=a7c3554c729d71929e0b84489addee6b2e8d5cb48595adfc51868c299c0c218e
    
    <?xml version="1.0" encoding="UTF-8"?>
    <PublicAccessBlockConfiguration>
      <BlockPublicAccess>true</BlockPublicAccess>
    </PublicAccessBlockConfiguration>
  • Sample success response

    HTTP/1.1 200 OK
    x-oss-request-id: 534B371674E88A4D8906****
    Date: Mon, 19 Feb 2024 08:40:17 GMT
    Server: AliyunOSS

OSS SDKs

The following OSS SDKs support PutPublicAccessBlock:

ossutil

For information about the ossutil command that corresponds to the PutPublicAccessBlock operation, see put-public-access-block.