Question

I’m implementing AFHTTPClient as a singleton class, as recommended in the docs, and calling that with JSON data in a post, and receiving JSON data in return:

[[BMNetworkCalls sharedInstance] postPath:theURL parameters:theDict success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"my return is: %@", [responseObject valueForKeyPath:@"Result"]);

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {            
    NSLog(@"error in network call: %@", [error localizedDescription]);
}];

All fine and good, but if I receive an error, (“error in HTTPRequestOperation: Expected status code in (200-299), got 400”), I actually want to read the responseObject here as well (this is the way the API I am using tells me what class of error I caused).

I could do that using AFJSONRequestOperation:

AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
    NSLog(@"my return is: %@", [JSON valueForKeyPath:@"Result"]);

} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
    NSLog(@"exception code: %@", [JSON valueForKeyPath:@"ExceptionCode"]);
    NSLog(@"exception message: %@", [JSON valueForKeyPath:@"ExceptionMessage"]);
}];
[operation start];

How can I (and can I?) do it using AFHTTPClient?

Answer 1

The operation variable has everything that you need:

[[BMNetworkCalls sharedInstance] postPath:theURL parameters:theDict success:^(AFHTTPRequestOperation *operation, id responseObject) {
  // ...
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    if ([operation isKindOfClass:[AFJSONRequestOperation class]]) {
      id JSON = [(AFJSONRequestOperation *)operation responseJSON];
      NSLog(@"JSON: %@", JSON)
    }
}];