Question

I have this code in case of failure:

failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON)

and I want to log the string that is returned. Out of which variable should I do that and how?

Answer 1

So typically you want to print the error, this will print any thing that your server is reporting as an error. Failure messages are triggered when it received the wrong type it was expecting (plaintext instead of application/json) or if the status code is >400 like (404, 401) stuff like that.

If you’re doing error checking you should either set the statuscode in the response header and then compare it to response.statusCode or most likely when you are returning data you should error check in the success block.

If you absolutely need to access the responseString from the response you can use operation.responseString where operation is the AF Request Operation.

update

here is an example from @mattt at https://github.com/AFNetworking/AFNetworking/issues/137:

[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"Friend Request Sent");
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"[Error]: (%@ %@) %@", [operation.request HTTPMethod], [[operation.request URL] relativePath], operation.error);
}];