public IActionResult GetCoursesBySemester(int page = 1, string semester = null) { try { return(Ok(_service.GetCourseInstancesBySemester( LanguageUtils.GetLanguage(Request.Headers["Accept-Language"]), page, semester))); } catch (AppObjectNotFoundException e) { return(StatusCode(415, e.Message)); } catch (Exception e) { return(StatusCode(500, e.Message)); } }