public String getCustomResponseBodyKey() {
        return this.customResponseBodyKey;
    }
<p>
References the response body that you want WAF to return to the web request client. You can define a custom
response for a rule action or a default web ACL action that is set to block. To do this, you first define the
response body key and value in the <code>CustomResponseBodies</code> setting for the <a>WebACL</a> or
<a>RuleGroup</a> where you want to use it. Then, in the rule action or web ACL default action
<code>BlockAction</code> setting, you reference the response body using this key.
</p>

@return References the response body that you want WAF to return to the web request client. You can define a
        custom response for a rule action or a default web ACL action that is set to block. To do this, you first
        define the response body key and value in the <code>CustomResponseBodies</code> setting for the
        <a>WebACL</a> or <a>RuleGroup</a> where you want to use it. Then, in the rule action or web ACL default
        action <code>BlockAction</code> setting, you reference the response body using this key.
aws-java-sdk-wafv2/src/main/java/com/amazonaws/services/wafv2/model/CustomResponse.java