Use nil instead of DISPATCH_DATA_DESTRUCTOR_DEFAULT?
Use nil instead of DISPATCH_DATA_DESTRUCTOR_DEFAULT?

AlwaysRightInstitute/SwiftSockets,AlwaysRightInstitute/SwiftSockets,AlwaysRightInstitute/SwiftSockets,luosheng/SwiftSockets,adrianomazucato/SwiftSockets,adrianomazucato/SwiftSockets,luosheng/SwiftSockets