AWS SDK Version 3 for .NET
API Reference

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This operation is not supported by directory buckets.

Sets the cors configuration for your bucket. If the configuration exists, Amazon S3 replaces it.

To use this operation, you must be allowed to perform the s3:PutBucketCORS action. By default, the bucket owner has this permission and can grant it to others.

You set this configuration on a bucket so that the bucket can service cross-origin requests. For example, you might want to enable a request whose origin is to access your Amazon S3 bucket at by using the browser's XMLHttpRequest capability.

To enable cross-origin resource sharing (CORS) on a bucket, you add the cors subresource to the bucket. The cors subresource is an XML document in which you configure rules that identify origins and the HTTP methods that can be executed on your bucket. The document is limited to 64 KB in size.

When Amazon S3 receives a cross-origin request (or a pre-flight OPTIONS request) against a bucket, it evaluates the cors configuration on the bucket and uses the first CORSRule rule that matches the incoming browser request to enable a cross-origin request. For a rule to match, the following conditions must be met:

For more information about CORS, go to Enabling Cross-Origin Resource Sharing in the Amazon S3 User Guide.

The following operations are related to PutBucketCors:


For .NET Core this operation is only available in asynchronous form. Please refer to PutCORSConfigurationAsync.

Namespace: Amazon.S3
Assembly: AWSSDK.S3.dll
Version: 3.x.y.z


public virtual PutCORSConfigurationResponse PutCORSConfiguration(
         String bucketName,
         CORSConfiguration configuration


Type: System.String

Specifies the bucket impacted by the corsconfiguration.

Type: Amazon.S3.Model.CORSConfiguration

Describes the cross-origin access configuration for objects in an Amazon S3 bucket. For more information, see Enabling Cross-Origin Resource Sharing in the Amazon S3 User Guide.

Return Value

The response from the PutCORSConfiguration service method, as returned by S3.

Version Information

.NET Framework:
Supported in: 4.5, 4.0, 3.5

See Also