nsurlconnection - response.expectedContentLength allway return -1 -


i have connection use nsurlconnection, want draw progress connection when try print current received data , total data length, went wrong ,response.expectedcontentlength allway return -1, why , happen connection, how can fix 

 - (void)connection:(nsurlconnection *)connection didreceivedata:(nsdata *)data     {         receiveddatabytes += [data length];         nslog(@"data: %f",receiveddatabytes);         [responsedata appenddata:data];     }      - (void)connection:(nsurlconnection *)connection didreceiveresponse:(nsurlresponse *)response     {         self.httpstatuscode = [(nshttpurlresponse *)response statuscode];         totalfilesize = response.expectedcontentlength;         nslog(@"total: %lf",totalfilesize);     }

output:

total: -1.000000 data: 1256.000000 total: -1.000000 data: 1034.000000 total: -1.000000 data: 1127.000000


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