!!! Overview
[{$pagename}] ([Javascript Object Signing and Encryption] Header) the members of the [JSON] object(s) representing the [JOSE] [Header] describe the [Digital Signature] or [MAC] applied to the [JSON Web Signature] ([JWS]) Protected [Header] and the [JWS] [Payload] and optionally additional properties of the [JWS].  


The [Header] Parameter names within the [{$pagename}] [MUST] be unique; [JWS] parsers [MUST] either reject JWSs with duplicate [JOSE Header Parameter] names or use a [JSON] parser that returns only the lexically last duplicate member name, as specified in Section 15.12 (The [JSON] Object) of [ECMAScript] 5.1 [ECMAScript].

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]