# HttpActionHeader
<a name="API_HttpActionHeader"></a>

The HTTP action header.

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

 ** key **   <a name="iot-Type-HttpActionHeader-key"></a>
The HTTP header key.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 256.  
Required: Yes

 ** value **   <a name="iot-Type-HttpActionHeader-value"></a>
The HTTP header value. Substitution templates are supported.  
Type: String  
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/iot-2015-05-28/HttpActionHeader) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/iot-2015-05-28/HttpActionHeader) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/iot-2015-05-28/HttpActionHeader)