gistfile1.m

    
    NSString *deviceUUID = [[NSUserDefaults standardUserDefaults] valueForKey:UUID_USER_DEFAULTS_KEY];
    NSDictionary* params = [NSDictionary dictionaryWithObjectsAndKeys:
                            usernameField.text, @"user[pawsid]",
                            passwordField.text, @"user[password]",
                            deviceUUID, @"user[device_uuid]", nil];
    NSString *urlString = [NSString stringWithFormat:@"%@://%@:%@/api/v2/json/api_users/sign_in",
                           [NSObject TT_PROTOCOL], [NSObject TT_HOST], [NSObject TT_PORT]];
    AFHTTPClient *httpClient = [RKObjectManager sharedManager].HTTPClient;
    NSURLRequest *request = [httpClient requestWithMethod:@"POST" path:urlString parameters:params];
    RKHTTPRequestOperation *operation = [[RKHTTPRequestOperation alloc] initWithRequest:request];
    [operation setCompletionBlockWithSuccess:^(RKHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"success: %@", operation.responseString);
    }
    failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"error: %@",  operation.responseString);
    }];