Abstractions map WCF Web API vs ASP.NET Web API

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there are some concepts map between old WCF Web API and new ASP.NET Web API.

(From WCF Official page)

The WCF Web API abstractions map to ASP.NET Web API roughly as follows

WCF Web API	WCF Web API
Service	Web API controller
Operation	Action
Service contract	Not applicable
Endpoint	Not applicable
URI templates	ASP.NET Routing
Message handlers	Same
Formatters	Same
Operation handlers	Filters, model binders