Bonjour Operations
https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/NetServices/Articles/NetServicesArchitecture.html
+V why_null 请备注:from博客园
https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/NetServices/Articles/NetServicesArchitecture.html
+V atob('d2h5X251bGw=')
请备注:from博客园