iphone - AFNetworking Expected content type error -

i getting json string in failure block

 nsurl *url = [[nsurl alloc] initwithstring:@"http://www.vinipost.com/services/update/updateservice.asmx/getpropsubtype?"];         nsurlrequest *request = [[nsurlrequest alloc] initwithurl:url];         [afjsonrequestoperation addacceptablecontenttypes:[nsset setwithobject:@"text/html"]];          afjsonrequestoperation *operation = [afjsonrequestoperation jsonrequestoperationwithrequest:request success:^(nsurlrequest *request, nshttpurlresponse *response, id json) {              nslog(@"%@", json);         } failure:^(nsurlrequest *request, nshttpurlresponse *response, nserror *error, id json) {             nslog(@"request failed error: %@, %@", error, error.userinfo);         }];         [operation start]; 

output:

request failed error: error domain=afnetworkingerrordomain code=-1016 "expected content type {(     "text/json",     "text/javascript",     "application/json",     "text/html" )}, got text/plain" userinfo=0x71521a0 {nslocalizedrecoverysuggestion=[{"proptypid":1,"propcatid":1,"proptyp":"flat/ condo"}.......** 

the error clear: web service returning wrong content type. content type should 1 of these:

"text/json", "text/javascript", "application/json", "text/html"

but returns

text/plain

moreover, if @ http response, returns html tags inside it, afnetworking not able parse.

if page:

http://www.vinipost.com/services/update/updateservice.asmx/getpropsubtype? 

is under control, correct behavior removing html tags , changing content type