MBTNetworkManager *manager = [[MBTNetworkManager alloc] initWithBaseURL:[NSURL URLWithString:@"http://httpbin.org"]];

[manager performRequest:[MBTSampleRequests get]].then(^(MBTHTTPBinGetModel *getModel, NSURLSessionTask *task) {
    NSLog(@"Origin: %@", getModel.origin);
    NSLog(@"User-Agent: %@", getModel.headers.userAgent);

    return [manager performRequest:[MBTSampleRequests headers]];
}).then(^(MBTHTTPBinHeadersModel *headersModel, NSURLSessionTask *task) {
    NSLog(@"Headers: %@", headersModel);
}).catch(^(NSError *error) {
    NSLog(@"Error: %@", error);
});