json - How do I convert this curl command to Objective-C? -

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i want data backend. should set request header authorization , use generate auth_token previous interaction backend. here curl

curl -h 'authorization: token token="replace-with-token"' http://domain.com/books

here code

  nsurl *url = [nsurl urlwithstring:@"http://domain.com/books"];     config = [nsurlsessionconfiguration defaultsessionconfiguration];     [config sethttpadditionalheaders:@{@"token":@"4959a0bc00a15e335fb6"}];     nsurlsession *session = [nsurlsession sessionwithconfiguration:config];     [[session datataskwithurl:url completionhandler:^(nsdata *data, nsurlresponse *response, nserror *error) {         nslog(@"%@", [nsjsonserialization jsonobjectwithdata:data options:0 error:nil]);     }] resume];

i not sure if implemented curl correctly. data,which received backend, null . 1 know reason?

a curl header of 'authorization: token token="replace-with-token"' translate into:

[config sethttpadditionalheaders:@{@"authorization":@"token=\"4959a0bc00a15e335fb6\""}];

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