Objective c post with json data request to server -

i trying post data server , send data json this

data: {"userid":"aaaaa","token":"12345","type":"bbb","version":"45"}

here image

 nsdictionary *requestdictionary = @{@"data" : @{                                        @"{userid" : @"aaa", @"token ": @"12345",@"type":@"ios",@"version":@"1}"}};  nsurl *urls =[nsurl urlwithstring:[nsstring stringwithformat:@"http://url/send_code"]];  self.request = [[nsmutableurlrequest alloc]init];  [self.request seturl:urls]; nsstring *contenttype = [nsstring stringwithformat:                          @"application/json"]; [request addvalue:contenttype forhttpheaderfield: @"content-type"];  [request sethttpmethod:@"post"]; [request addvalue:@"ios" forhttpheaderfield: @"x-application-platform"]; [request setvalue:@"application/x-www-form-urlencoded" forhttpheaderfield:@"content-type"];  [request sethttpbody:[nsjsonserialization datawithjsonobject:requestdictionary options:0 error:nil]]; nsdata *postdata = [nsjsonserialization datawithjsonobject:requestdictionary options:0 error:nil];  urlconnection = [[nsurlconnection alloc]initwithrequest:request delegate:self startimmediately:true]; 

i ve tried several times , invalid data response

please me.thanks in advance

try send using afnetworking:

first try convert json dictionary.

nserror *error; nsdata *objectdata = [@"{your dictionary}" datausingencoding:nsutf8stringencoding]; nsdictionary *json = [nsjsonserialization jsonobjectwithdata:objectdata                                       options:nsjsonreadingmutablecontainers                                          error:&error]; 

then can send dictionary:

afhttpsessionmanager *manager = [afhttpsessionmanager manager]; manager.responseserializer.acceptablecontenttypes = [nsset setwithobject:@"text/html"];  [manager post:@"your_url" parameters:json progress:nil success:^(nsurlsessiondatatask * _nonnull task, id  _nullable responseobject) {     nslog(@"complete"); } failure:^(nsurlsessiondatatask * _nullable task, nserror * _nonnull error) {     nslog(@"fail"); }];