# RateLimitJA3Fingerprint


 Use the request's JA3 fingerprint derived from the TLS Client Hello of an incoming request as an aggregate key. If you use a single JA3 fingerprint as your custom key, then each value fully defines an aggregation instance. 

## Contents


 ** FallbackBehavior **   <a name="WAF-Type-RateLimitJA3Fingerprint-FallbackBehavior"></a>
The match status to assign to the web request if there is insufficient TSL Client Hello information to compute the JA3 fingerprint.  
You can specify the following fallback behaviors:  
+  `MATCH` - Treat the web request as matching the rule statement. AWS WAF applies the rule action to the request.
+  `NO_MATCH` - Treat the web request as not matching the rule statement.
Type: String  
Valid Values: `MATCH | NO_MATCH`   
Required: Yes

## See Also


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/wafv2-2019-07-29/RateLimitJA3Fingerprint) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/wafv2-2019-07-29/RateLimitJA3Fingerprint) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/wafv2-2019-07-29/RateLimitJA3Fingerprint)