Application-wide proxy setting
Add the following line to your application before any network call:
[AppProxyCap activate];
[AppProxyCap setProxy:AppProxy_HTTP Host:@"127.0.0.1" Port:8086];
HTTP traffic in current app via CFNetwork (e.g. NSURLConnection) will go through 127.0.0.1:8086 HTTP proxy afterwards, traffic in other application is not affected.
Tested in Mac OS X 10.7.2, 10.8.1; iOS 5.0, 6.0 device and simulator
Released in MIT License