# BlockAction
<a name="API_BlockAction"></a>

Specifies that Amazon 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 [RuleAction](API_RuleAction.md) and web ACL [DefaultAction](API_DefaultAction.md). 

## Contents
<a name="API_BlockAction_Contents"></a>

 ** CustomResponse **   <a name="WAF-Type-BlockAction-CustomResponse"></a>
Defines a custom response for the web request.  
For information about customizing web requests and responses, see [Customizing web requests and responses in Amazon WAF](https://docs.amazonaws.cn/waf/latest/developerguide/waf-custom-request-response.html) in the * Amazon WAF Developer Guide*.   
Type: [CustomResponse](API_CustomResponse.md) object  
Required: No

## See Also
<a name="API_BlockAction_SeeAlso"></a>

For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon SDK for C\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/wafv2-2019-07-29/BlockAction) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/wafv2-2019-07-29/BlockAction) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/wafv2-2019-07-29/BlockAction)