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Showing content from https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetBucketCors.html below:

GetBucketCors - Amazon Simple Storage Service

GetBucketCors

Note

This operation is not supported for directory buckets.

Returns the Cross-Origin Resource Sharing (CORS) configuration information set for the bucket.

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

When you use this API operation with an access point, provide the alias of the access point in place of the bucket name.

When you use this API operation with an Object Lambda access point, provide the alias of the Object Lambda access point in place of the bucket name. If the Object Lambda access point alias in a request is not valid, the error code InvalidAccessPointAliasError is returned. For more information about InvalidAccessPointAliasError, see List of Error Codes.

For more information about CORS, see Enabling Cross-Origin Resource Sharing.

The following operations are related to GetBucketCors:

Important

You must URL encode any signed header values that contain spaces. For example, if your header value is my file.txt, containing two spaces after my, you must URL encode this value to my%20%20file.txt.

Request Syntax

GET /?cors HTTP/1.1
Host: Bucket.s3.amazonaws.com
x-amz-expected-bucket-owner: ExpectedBucketOwner

URI Request Parameters

The request uses the following URI parameters.

The bucket name for which to get the cors configuration.

When you use this API operation with an access point, provide the alias of the access point in place of the bucket name.

Required: Yes

The account ID of the expected bucket owner. If the account ID that you provide does not match the actual owner of the bucket, the request fails with the HTTP status code 403 Forbidden (access denied).

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200
<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration>
   <CORSRule>
      <AllowedHeader>string</AllowedHeader>
      ...
      <AllowedMethod>string</AllowedMethod>
      ...
      <AllowedOrigin>string</AllowedOrigin>
      ...
      <ExposeHeader>string</ExposeHeader>
      ...
      <ID>string</ID>
      <MaxAgeSeconds>integer</MaxAgeSeconds>
   </CORSRule>
   ...
</CORSConfiguration>

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in XML format by the service.

CORSConfiguration

Root level tag for the CORSConfiguration parameters.

Required: Yes

CORSRule

A set of origins and methods (cross-origin access that you want to allow). You can add up to 100 rules to the configuration.

Type: Array of CORSRule data types

Examples Configure CORS Sample Request

The following PUT request adds the cors subresource to a bucket (amzn-s3-demo-bucket).


PUT /?cors HTTP/1.1
Host: amzn-s3-demo-bucket.s3.<Region>.amazonaws.com 
x-amz-date: Tue, 21 Aug 2012 17:54:50 GMT
Content-MD5: 8dYiLewFWZyGgV2Q5FNI4W==
Authorization: authorization string
Content-Length: 216

<CORSConfiguration>
 <CORSRule>
   <AllowedOrigin>http://www.example.com</AllowedOrigin>
   <AllowedMethod>PUT</AllowedMethod>
   <AllowedMethod>POST</AllowedMethod>
   <AllowedMethod>DELETE</AllowedMethod>
   <AllowedHeader>*</AllowedHeader>
   <MaxAgeSeconds>3000</MaxAgeSec>
   <ExposeHeader>x-amz-server-side-encryption</ExposeHeader>
 </CORSRule>
 <CORSRule>
   <AllowedOrigin>*</AllowedOrigin>
   <AllowedMethod>GET</AllowedMethod>
   <AllowedHeader>*</AllowedHeader>
   <MaxAgeSeconds>3000</MaxAgeSeconds>
 </CORSRule>
</CORSConfiguration>

Example

This is the sample response to the preceding request.


HTTP/1.1 200 OK
x-amz-id-2: CCshOvbOPfxzhwOADyC4qHj/Ck3F9Q0viXKw3rivZ+GcBoZSOOahvEJfPisZB7B
x-amz-request-id: BDC4B83DF5096BBE
Date: Tue, 21 Aug 2012 17:54:50 GMT
Server: AmazonS3

Sample Request: Retrieve cors subresource

The following example gets the cors subresource of a bucket.


            GET /?cors HTTP/1.1
            Host: amzn-s3-demo-bucket.s3.<Region>.amazonaws.com
            Date: Tue, 13 Dec 2011 19:14:42 GMT
            Authorization: signatureValue

Example

Sample Response


            HTTP/1.1 200 OK
            x-amz-id-2: 0FmFIWsh/PpBuzZ0JFRC55ZGVmQW4SHJ7xVDqKwhEdJmf3q63RtrvH8ZuxW1Bol5
            x-amz-request-id: 0CF038E9BCF63097
            Date: Tue, 13 Dec 2011 19:14:42 GMT
            Server: AmazonS3
            Content-Length: 280
            <CORSConfiguration>
                 <CORSRule>
                   <AllowedOrigin>http://www.example.com</AllowedOrigin>
                   <AllowedMethod>GET</AllowedMethod>
                   <MaxAgeSeconds>3000</MaxAgeSec>
                  <ExposeHeader>x-amz-server-side-encryption</ExposeHeader>
                </CORSRule>
            </CORSConfiguration>