Returning http status code from Web Api controller

Question

I'm trying to return a status code of 304 not modified for a GET method in a web api controller.

The only way I succeeded was something like this:

public class TryController : ApiController {     public User GetUser(int userId, DateTime lastModifiedAtClient)     {         var user = new DataEntities().Users.First(p => p.Id == userId);         if (user.LastModified <= lastModifiedAtClient)         {              throw new HttpResponseException(HttpStatusCode.NotModified);         }         return user;     } } 

The problem here is that it's not an exception, It's just not modified so the client cache is OK. I also want the return type to be a User (as all the web api examples shows with GET) not return HttpResponseMessage or something like this.

Answer 1

I did not know the answer so asked the ASP.NET team here.

So the trick is to change the signature to HttpResponseMessage and use Request.CreateResponse.

[ResponseType(typeof(User))] public HttpResponseMessage GetUser(HttpRequestMessage request, int userId, DateTime lastModifiedAtClient) {     var user = new DataEntities().Users.First(p => p.Id == userId);     if (user.LastModified <= lastModifiedAtClient)     {          return new HttpResponseMessage(HttpStatusCode.NotModified);     }     return request.CreateResponse(HttpStatusCode.OK, user); }