# CustomHttpHeader
<a name="API_CustomHttpHeader"></a>

Represents a custom HTTP header that can be included in AS2 messages. Each header consists of a key-value pair.

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

 ** Key **   <a name="TransferFamily-Type-CustomHttpHeader-Key"></a>
The name of the custom HTTP header.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 64.  
Pattern: `[a-zA-Z0-9-]+`   
Required: No

 ** Value **   <a name="TransferFamily-Type-CustomHttpHeader-Value"></a>
The value of the custom HTTP header.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 256.  
Pattern: `[a-zA-Z0-9 +\-./:=@_]*`   
Required: No

## 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/transfer-2018-11-05/CustomHttpHeader) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/transfer-2018-11-05/CustomHttpHeader) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/transfer-2018-11-05/CustomHttpHeader)