# CustomHTTPHeader
<a name="API_CustomHTTPHeader"></a>

A custom header for custom request and response handling. This is used in [CustomResponse](API_CustomResponse.md) and [CustomRequestHandling](API_CustomRequestHandling.md).

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

 ** Name **   <a name="WAF-Type-CustomHTTPHeader-Name"></a>
The name of the custom header.   
For custom request header insertion, when AWS WAF inserts the header into the request, it prefixes this name `x-amzn-waf-`, to avoid confusion with the headers that are already in the request. For example, for the header name `sample`, AWS WAF inserts the header `x-amzn-waf-sample`.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 64.  
Pattern: `^[a-zA-Z0-9._$-]+$`   
Required: Yes

 ** Value **   <a name="WAF-Type-CustomHTTPHeader-Value"></a>
The value of the custom header.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 255.  
Pattern: `.*`   
Required: Yes

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