* Easy access to request and response HTTP headers
* Progress delegates (NSProgressIndicators and UIProgressViews) to show information about download AND upload progress
* Auto-magic management of upload and download progress indicators for operation queues
* Basic + Digest authentication support, credentials are automatically re-used for the duration of a session, and can be stored for later in the Keychain.
* Basic, Digest + NTLM authentication support, credentials are automatically re-used for the duration of a session, and can be stored for later in the Keychain.
* Cookie support
* GZIP support for response data
* Based on NSOperation to make queuing requests and background operation easy