AFNetworking not receiving response data - ios

Question

I am using AFNetworking to GET request by posting json object. But i am receiving empty value. I am using the following code.
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
NSDictionary *params = # {#"email" :user_name, #"password" :pass_word };
[manager GET:HOST_URL parameters:params
success:^(AFHTTPRequestOperation *operation, id responseObject)
{
NSLog(#"JSON: %#", responseObject);
NSDictionary *weather = (NSDictionary *)responseObject;
}
failure:
^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", error);
NSLog(#"opstr%#",operation.responseString);
}];
What method i should use. If i use POST, i am getting error saying that "The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.)
When i use GET i am getting response as empty. I am not sure where i am wrong.
Thanks in advance.

Answer 1

It means that your request response is not a valid json. You can correct the web service to return proper json. Or remove the following line
manager.requestSerializer = [AFJSONRequestSerializer serializer];
because it is converting response to json.
To allow fragments, change the code to following
[manager GET:HOST_URL parameters:params
success:^(AFHTTPRequestOperation *operation, id responseObject)
{
id json = [NSJSONSerialization JSONObjectWithData:responseObject
options:NSJSONReadingAllowFragments
error:&deserializingError];
NSLog(#"JSON: %#", responseObject);
NSDictionary *weather = (NSDictionary *)responseObject;
}
failure:
^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", error);
NSLog(#"opstr%#",operation.responseString);
}];