AWS::WAFv2::WebACL BlockAction - AWS CloudFormation

AWS::WAFv2::WebACL BlockAction

Specifies that AWS WAF should block the request and optionally defines additional custom handling for the response to the web request.

This is used in the context of other settings, for example to specify values for a rule action or a web ACL default action.


To declare this entity in your AWS CloudFormation template, use the following syntax:



Defines a custom response for the web request.

For information about customizing web requests and responses, see Customizing web requests and responses in AWS WAF in the AWS WAF Developer Guide.

Required: No

Type: CustomResponse

Update requires: No interruption


Set an block action

The following shows an example block action specification.


Action: Block: {}


"Action": { "Block": {} }

Set a block action with a custom response setting

The following shows an example block action specification with a custom response setting.


Block: CustomResponse: ResponseCode: 503 CustomResponseBodyKey: CustomResponseBodyKey1 ResponseHeaders: - Name: BlockActionHeader1Name Value: BlockActionHeader1Value - Name: BlockActionHeader2Name Value: BlockActionHeader2Value


"Block": { "CustomResponse": { "ResponseCode": 503, "CustomResponseBodyKey": "CustomResponseBodyKey1", "ResponseHeaders": [ { "Name": "BlockActionHeader1Name", "Value": "BlockActionHeader1Value" }, { "Name": "BlockActionHeader2Name", "Value": "BlockActionHeader2Value" } ] } }