问alamofire responseStreamString解码

EN

let req = AF.streamRequest(...)
req.responseStreamString { stream in
    switch stream.event {
    case let .stream(result):
          switch result {
          case let .success(string):
            print(string)
          case let .failure(error):
            print("failure")
              print(error)
          }
    case .complete(_): //
        print("complete")
    }

--eventStreamBoundary
Content-Type: text/plain
Content-Length: 23
20200428124609 5 X NULL