Can anybody please explain AFHTTPSessionManager

Question

Can anyone please explain what is happening in the following code:

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
[manager GET:[url absoluteString]
  parameters:nil
     success:^(NSURLSessionDataTask *task, id JSON) {
         NSLog(@"JSON: %@", JSON);
}

Answer 1

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

This is simply an instance of the class which manages HTTPconnections.

manager.requestSerializer = [AFJSONRequestSerializer serializer];

This means that any parameters of your request (in your case there are no parameters, but usually a dictionary is passed there) will be sent over the network as JSON.

[manager GET:[url absoluteString]
 parameters:nil
 success:^(NSURLSessionDataTask *task, id JSON) {
     NSLog(@"JSON: %@", JSON);
}

Here the manager performs GET request to the specified url without any parameters and receives some JSON data in the response block. You can turn this JSON into a dictionary or array and use according to your needs.