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?.

Solution

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.