Printing description of error:
Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0x15e9b5a0 {NSErrorFailingURLStringKey=http://v0.api.upyun.com/mypetcantalk/, NSErrorFailingURLKey=http://v0.api.upyun.com/mypetcantalk/, NSLocalizedDescription=The request timed out., NSUnderlyingError=0x15e9ab90 "The request timed out."}
(lldb)