Web API 2 media controller that handles partial content requests

MediaApiController.cs

  public class MediaApiController : ApiController
  {

    public HttpResponseMessage Get(string filepath)
    {
      var path = HostingEnvironment.MapPath($"~/media/{filepath}") ?? string.Empty;
      var mediaType = MediaTypeHeaderValue.Parse(MimeMapping.GetMimeMapping(filepath));
      FileStream stream;

      try
      {
        stream = new FileStream(path, FileMode.Open, FileAccess.Read);
      }
      catch (FileNotFoundException)
      {
        return Request.CreateResponse(HttpStatusCode.NotFound);
      }

      if (Request.Headers.Range != null)
      {
        try
        {
          var response = Request.CreateResponse(HttpStatusCode.PartialContent);
          response.Content = new ByteRangeStreamContent(stream, Request.Headers.Range, mediaType);
          response.Content.Headers.Expires = DateTimeOffset.Now.AddYears(10);
          response.Headers.Add("Accept-Ranges", "bytes");
          response.Headers.CacheControl = CacheControlHeaderValue.Parse("public");
          return response;
        }
        catch (InvalidByteRangeException invalidByteRangeException)
        {
          return Request.CreateErrorResponse(invalidByteRangeException);
        }
      }
      else
      {
        var response = Request.CreateResponse(HttpStatusCode.OK);
        response.Content = new StreamContent(stream);
        response.Content.Headers.ContentType = mediaType;
        response.Content.Headers.Expires = DateTimeOffset.Now.AddYears(10);
        response.Headers.Add("Accept-Ranges", "bytes");
        response.Headers.CacheControl = CacheControlHeaderValue.Parse("public");
        return response;
      }
    }

  }