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v1

latestOpenAPI 3.0.0Apache 2.0 License2026-07-1497574737.9 KB

Creates or modifies the PublicAccessBlock configuration for an Amazon S3 bucket. To use this operation, you must have the s3:PutBucketPublicAccessBlock permission. For more information about Amazon S3 permissions, see Specifying Permissions in a Policy.

When Amazon S3 evaluates the PublicAccessBlock configuration for a bucket or an object, it checks the PublicAccessBlock configuration for both the bucket (or the bucket that contains the object) and the bucket owner's account. If the PublicAccessBlock configurations are different between the bucket and the account, Amazon S3 uses the most restrictive combination of the bucket-level and account-level settings.

For more information about when Amazon S3 considers a bucket or an object public, see The Meaning of "Public".

Related Resources

put/{Bucket}#publicAccessBlock

Path parameters

Bucketstring required

The name of the Amazon S3 bucket whose <code>PublicAccessBlock</code> configuration you want to set.

Query parameters

publicAccessBlocktrue required

Headers

Content-MD5string
<p>The MD5 hash of the <code>PutPublicAccessBlock</code> request body. </p> <p>For requests made using the Amazon Web Services Command Line Interface (CLI) or Amazon Web Services SDKs, this field is calculated automatically.</p>
x-amz-sdk-checksum-algorithm'CRC32' | 'CRC32C' | 'SHA1' | 'SHA256'
<p>Indicates the algorithm used to create the checksum for the object when using the SDK. This header will not provide any additional functionality if not using the SDK. When sending this header, there must be a corresponding <code>x-amz-checksum</code> or <code>x-amz-trailer</code> header sent. Otherwise, Amazon S3 fails the request with the HTTP status code <code>400 Bad Request</code>. For more information, see <a href="https://docs.aws.amazon.com/AmazonS3/latest/userguide/checking-object-integrity.html">Checking object integrity</a> in the <i>Amazon S3 User Guide</i>.</p> <p>If you provide an individual checksum, Amazon S3 ignores any provided <code>ChecksumAlgorithm</code> parameter.</p>
x-amz-expected-bucket-ownerstring

The account ID of the expected bucket owner. If the bucket is owned by a different account, the request fails with the HTTP status code <code>403 Forbidden</code> (access denied).

Response

Success