SVHTTPClient

AppDelegate.m

- (void)setupSVHTTPClient 
{
    [[SVHTTPClient sharedClient] setValue:@"test" forHTTPHeaderField:@"Client"];
    [[SVHTTPClient sharedClient] setValue:@"373e606658a8b539dfeeecac7f10ad33078e2ba15a80d5686ae2" forHTTPHeaderField:@"Secret"];
    [[SVHTTPClient sharedClient] setBasePath:@"https://server.com/api"];
    [[SVHTTPClient sharedClient] setSendParametersAsJSON:YES];    
}

SomeOtherFile.m

NSString *url = [NSString stringWithFormat:@"/albums/%d/", album.albumId];
[[SVHTTPClient sharedClient] GET:url
                      parameters:nil
                      completion:^(id response, NSHTTPURLResponse *urlResponse, NSError *error) {
                          if (error) {
                              //bad things
                          } else {
                              //good things
                          }
}];