Redirect in a .NET API action filter

Question

I'd like to be able to read a Request header in an ActionFilterAttribute, and direct the user. I'd also like to maintain the existing Request, or pass the controller and URL params to the new Request. I know this is easy in MVC, but haven't done it in a web API.

Answer 1

Actually it is very easy. You just create HttpResponseMessage object.

public class RedirectAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            var response = actionContext.Request.CreateResponse(HttpStatusCode.Redirect);
            response.Headers.Location = new Uri("https://www.stackoverflow.com");
            actionContext.Response = response;
        }
    }