title: Get Data from AFHTTPSessionManager
body: <p>Since I am new to IOS and AFNetworking 3,0 is new, I don't know how to retrieve data from AFHTTPSessionManager.
  I have to following message and I want to return the result </p>
  
  <pre><code>- (NSString *) makeServiceCall;
  {
      NSString *response = @"";
      @try {
  
          AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
          [manager
           POST:self.url.absoluteString
           parameters:self.parameters
           progress:nil
           success:^(NSURLSessionDataTask *task, id  responseObject) {
               NSLog(@"Success: %@", responseObject);}
           failure:^(NSURLSessionDataTask *  task, NSError *  error) {
               NSLog(@"Error: %@", error);
           }];
          [AFHTTPSessionManager manager].securityPolicy.allowInvalidCertificates = YES;
      }
      @catch (NSException *exception) {
          NSLog(@"%@", exception.reason);
      }
  }
  </code></pre>