In BSParseDotComRequestSerializer revise comments, try clearAuthorizationHeader, override requestWithMethod:URLString:parameters: to help with debugging.
Move code from SDDateTableViewController.m to BSHTTPSessionManager new method getHoliday. Currently getHoliday returns error. Add getHoliday2 using NSURLSession instead of AFNetworking 2.0. getHoliday2 succeeds.