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Anti-DDoS:DescribeHeaders

Last Updated:Apr 08, 2026

Queries the custom headers for a domain name.

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RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

  • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

  • API: The API that you can call to perform the action.

  • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

  • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

    • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

    • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

  • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

  • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

yundun-ddoscoo:DescribeHeaders

get

*All Resource

*

None None

Request parameters

Parameter

Type

Required

Description

Example

ResourceGroupId

string

No

The ID of the resource group in Resource Management to which the Anti-DDoS Pro or Anti-DDoS Premium instance belongs. This parameter is empty by default, which indicates that the instance belongs to the default resource group.

rg-aek3cmuvpia****

Domain

string

Yes

The domain name for which to query custom headers.

Note

You can call the DescribeDomains operation to query all domain names.

example.aliyundoc.com

Response elements

Element

Type

Description

Example

object

RequestId

string

The ID of the request.

48BC7BA5-69BE-5C31-A080-AFF2431AE48D

CustomHeader

object

The custom header information.

Headers

string

The custom headers. The value is a string that consists of a JSON object. The JSON object contains the following fields:

{"X-Forwarded-ClientSrcPort":"","header1":"hLeLele"}

Domain

string

The domain name of the website.

example.aliyundoc.com

EmbeddedHeaders

string

The request header that can be used to mark the Layer 7 attack. The value is a string that consists of a JSON object. The JSON object contains the following fields:

{"X-Client-IP":true,"X-True-IP":true,"Web-Server-Type":true,"WL-Proxy-Client-IP":true,"X-Forwarded-Proto":true}

Examples

Success response

JSON format

{
  "RequestId": "48BC7BA5-69BE-5C31-A080-AFF2431AE48D",
  "CustomHeader": {
    "Headers": "{\"X-Forwarded-ClientSrcPort\":\"\",\"header1\":\"hLeLele\"}",
    "Domain": "example.aliyundoc.com"
  },
  "EmbeddedHeaders": "{\"X-Client-IP\":true,\"X-True-IP\":true,\"Web-Server-Type\":true,\"WL-Proxy-Client-IP\":true,\"X-Forwarded-Proto\":true}"
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.