1. I want to use [zlib](http://www.zlib.net/) because I'm assuming it's the best & fastest way to gzip `NSData`. But, is there a better way?
2. If not, which version of the zlib library should I link to in Xcode: libz.dylib, libz.1.dylib, libz.1.1.3.dylib, or libz.1.2.5.dylib?
3. Please provide a code example of how to us zlib to convert `NSData *normalHTTPBody` into `NSData gzippedHTTPBody`