Basic Authentication with ASP.NET Web API Using Authentication Filter

Authorization filters and action filters have been around for a while in ASP.NET Web API but there is this new authentication filter introduced in Web API 2. Authentication filters have their own place in the ASP.NET Web API pipeline like other filters. Historically, authorization filters have been used to implement authentication and there is ton of samples out there with all kinds of authentication implemented in authorization filters. Web API 2 introduces the authentication filter so that authentication concerns can be separated out of authorization filter and put into an authentication filter.
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