ASP.NET Web API : Correct way to return a 401/unauthorised response

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You should be throwing a HttpResponseException from your API method, not HttpException:

throw new HttpResponseException(HttpStatusCode.Unauthorized);

Or, if you want to supply a custom message:

var msg = new HttpResponseMessage(HttpStatusCode.Unauthorized) { ReasonPhrase = "Oops!!!" };
throw new HttpResponseException(msg);

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