Q:

how do i get refresh token with each request?

I am Communicating with .net api over server and now in api they are using oAuth2. So in ios i have to get refresh token every time i'm making request and in another request i have to pass this token. Its like "bearer TOKEN".I am using AFNetworking in my app. Any idea to get this thing working?.

A:

In AFNetworking3 you will use HEAD request for getting refresh token. And then Fire your actual request on success block. 
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.requestSerializer = [AFHTTPRequestSerializer serializer];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
NSURLSessionDataTask *dataTask = [manager dataTaskWithHTTPMethod:@"HEAD" URLString:URLString parameters:parameters headerFields:headerFields success:^(NSURLSessionDataTask *task, __unused id responseObject) {
    if (success) {
        success(task);
        // on success block you can fire your final API with below refresh token
         [manager.requestSerializer setValue:@"Bearer RRFRESH_TOKEN" forHTTPHeaderField:@"Authorization"];
    }
} failure:failure];

[dataTask resume];

You and also create an operation object to perform both API which is more manageable and flexible.

