# CORS

This document provides instructions to manage [<mark style="color:blue;">CORS</mark>](https://docs.ionos.com/cloud/backup-and-storage/ionos-object-storage/settings/cors) using the CLI. Additionally, these tasks can also be performed using the [<mark style="color:blue;">DCD</mark>](https://docs.ionos.com/cloud/backup-and-storage/settings/cors#dcd) and [<mark style="color:blue;">API</mark>](https://api.ionos.com/docs/s3/v2/#tag/CORS).

{% hint style="info" %}
**Prerequisites:**

* Set up the AWS CLI by following the [<mark style="color:blue;">installation instructions</mark>](https://docs.ionos.com/cloud/backup-and-storage/ionos-object-storage/s3-tools/awscli/awscli-configure).
* Make sure to consider the supported [<mark style="color:blue;">Endpoints</mark>](https://docs.ionos.com/cloud/backup-and-storage/ionos-object-storage/endpoints).
* [<mark style="color:blue;">Versioning</mark>](https://docs.ionos.com/cloud/backup-and-storage/ionos-object-storage/settings/versioning) must be enabled for source and destination buckets.
  {% endhint %}

## Commands

Get the CORS configuration for the bucket `my-bucket`:

```
aws s3api get-bucket-cors --bucket my-bucket --endpoint-url https://s3.eu-central-2.ionoscloud.com

```

Set up CORS configuration for the bucket `my-bucket`:

```
aws s3api put-bucket-cors --bucket my-bucket --cors-configuration file://cors.json --endpoint-url https://s3.eu-central-2.ionoscloud.com

```

### Sample CORS request

```
{
 "CORSRules": [
 {
 "AllowedOrigins": ["http://www.example.com"],
 "AllowedHeaders": ["*"],
 "AllowedMethods": ["PUT", "POST", "DELETE"],
 "MaxAgeSeconds": 3000,
 "ExposeHeaders": ["x-amz-server-side-encryption"]
 },
 {
 "AllowedOrigins": ["*"],
 "AllowedHeaders": ["Authorization"],
 "AllowedMethods": ["GET"],
 "MaxAgeSeconds": 3000
 }
 ]
}
```

For more information, see [<mark style="color:blue;">put-bucket-cors</mark>](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/s3api/put-bucket-cors.html) command reference.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ionos.com/cloud/backup-and-storage/ionos-object-storage/s3-tools/awscli/awscli-cors.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.