Undocumented Foundation class that looks pretty useful for HTTP proxy configuration, including but not limited to the evaluation of PAC files.

@interface NSNetworkSettings : NSObject { NSNetworkSettingsInternal *_internal; }

• (id)sharedNetworkSettings;
• (id)init;
• (void)dealloc;
• (id)proxyPropertiesForURL:(id)fp8;
• (BOOL)isProxyNeededForURL:(id)fp8;
• (void)setProxyPropertiesForURL:(id)fp8 onStream:(struct __CFReadStream *)fp12;
• (BOOL)connectedToInternet:(BOOL)fp8;

@end

Does anyone have any experience using this class?

It does not evaluate PAC files