# FunctionAssociation
<a name="API_FunctionAssociation"></a>

A CloudFront function that is associated with a cache behavior in a CloudFront distribution.

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

 ** EventType **   <a name="cloudfront-Type-FunctionAssociation-EventType"></a>
The event type of the function, either `viewer-request` or `viewer-response`. You cannot use origin-facing event types (`origin-request` and `origin-response`) with a CloudFront function.  
Type: String  
Valid Values: `viewer-request | viewer-response | origin-request | origin-response`   
Required: Yes

 ** FunctionARN **   <a name="cloudfront-Type-FunctionAssociation-FunctionARN"></a>
The Amazon Resource Name (ARN) of the function.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 108.  
Pattern: `arn:aws:cloudfront::[0-9]{12}:function\/[a-zA-Z0-9-_]{1,64}`   
Required: Yes

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

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/cloudfront-2020-05-31/FunctionAssociation) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/cloudfront-2020-05-31/FunctionAssociation) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/cloudfront-2020-05-31/FunctionAssociation)