# AssociateWebACL
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**Note**  
 Amazon WAF Classic support will end on September 30, 2025.   
This is ** Amazon WAF Classic** documentation. For more information, see [Amazon WAF Classic](https://docs.amazonaws.cn/waf/latest/developerguide/classic-waf-chapter.html) in the developer guide.  
 **For the latest version of Amazon WAF **, use the Amazon WAFV2 API and see the [Amazon WAF Developer Guide](https://docs.amazonaws.cn/waf/latest/developerguide/waf-chapter.html). With the latest version, Amazon WAF has a single set of endpoints for regional and global use. 

Associates a web ACL with a resource, either an application load balancer or Amazon API Gateway stage.

## Request Syntax
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```
{
   "ResourceArn": "string",
   "WebACLId": "string"
}
```

## Request Parameters
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For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).

The request accepts the following data in JSON format.

 ** [ResourceArn](#API_wafRegional_AssociateWebACL_RequestSyntax) **   <a name="WAF-wafRegional_AssociateWebACL-request-ResourceArn"></a>
The ARN (Amazon Resource Name) of the resource to be protected, either an application load balancer or Amazon API Gateway stage.   
The ARN should be in one of the following formats:  
+ For an Application Load Balancer: `arn:aws:elasticloadbalancing:region:account-id:loadbalancer/app/load-balancer-name/load-balancer-id ` 
+ For an Amazon API Gateway stage: `arn:aws:apigateway:region::/restapis/api-id/stages/stage-name ` 
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 1224.  
Pattern: `.*\S.*`   
Required: Yes

 ** [WebACLId](#API_wafRegional_AssociateWebACL_RequestSyntax) **   <a name="WAF-wafRegional_AssociateWebACL-request-WebACLId"></a>
A unique identifier (ID) for the web ACL.   
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Pattern: `.*\S.*`   
Required: Yes

## Response Elements
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If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

## Errors
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For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** WAFInternalErrorException **   
The operation failed because of a system problem, even though the request was valid. Retry your request.  
HTTP Status Code: 500

 ** WAFInvalidAccountException **   
The operation failed because you tried to create, update, or delete an object by using an invalid account identifier.  
HTTP Status Code: 400

 ** WAFInvalidParameterException **   
The operation failed because Amazon WAF didn't recognize a parameter in the request. For example:  
+ You specified an invalid parameter name.
+ You specified an invalid value.
+ You tried to update an object (`ByteMatchSet`, `IPSet`, `Rule`, or `WebACL`) using an action other than `INSERT` or `DELETE`.
+ You tried to create a `WebACL` with a `DefaultAction` `Type` other than `ALLOW`, `BLOCK`, or `COUNT`.
+ You tried to create a `RateBasedRule` with a `RateKey` value other than `IP`.
+ You tried to update a `WebACL` with a `WafAction` `Type` other than `ALLOW`, `BLOCK`, or `COUNT`.
+ You tried to update a `ByteMatchSet` with a `FieldToMatch` `Type` other than HEADER, METHOD, QUERY\$1STRING, URI, or BODY.
+ You tried to update a `ByteMatchSet` with a `Field` of `HEADER` but no value for `Data`.
+ Your request references an ARN that is malformed, or corresponds to a resource with which a web ACL cannot be associated.
HTTP Status Code: 400

 ** WAFNonexistentItemException **   
The operation failed because the referenced object doesn't exist.  
HTTP Status Code: 400

 ** WAFUnavailableEntityException **   
The operation failed because the entity referenced is temporarily unavailable. Retry your request.  
HTTP Status Code: 400

## See Also
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For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon Command Line Interface V2](https://docs.amazonaws.cn/goto/cli2/waf-regional-2016-11-28/AssociateWebACL) 
+  [Amazon SDK for .NET V4](https://docs.amazonaws.cn/goto/DotNetSDKV4/waf-regional-2016-11-28/AssociateWebACL) 
+  [Amazon SDK for C\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/waf-regional-2016-11-28/AssociateWebACL) 
+  [Amazon SDK for Go v2](https://docs.amazonaws.cn/goto/SdkForGoV2/waf-regional-2016-11-28/AssociateWebACL) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/waf-regional-2016-11-28/AssociateWebACL) 
+  [Amazon SDK for JavaScript V3](https://docs.amazonaws.cn/goto/SdkForJavaScriptV3/waf-regional-2016-11-28/AssociateWebACL) 
+  [Amazon SDK for Kotlin](https://docs.amazonaws.cn/goto/SdkForKotlin/waf-regional-2016-11-28/AssociateWebACL) 
+  [Amazon SDK for PHP V3](https://docs.amazonaws.cn/goto/SdkForPHPV3/waf-regional-2016-11-28/AssociateWebACL) 
+  [Amazon SDK for Python](https://docs.amazonaws.cn/goto/boto3/waf-regional-2016-11-28/AssociateWebACL) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/waf-regional-2016-11-28/AssociateWebACL)