outgoingMessage.socket
对底层套接字的引用。通常，用户不会希望访问此属性。
¥Reference to the underlying socket. Usually, users will not want to access this property.
调用 outgoingMessage.end() 后，该属性将被清空。
¥After calling outgoingMessage.end(), this property will be nulled.
对底层套接字的引用。通常，用户不会希望访问此属性。
¥Reference to the underlying socket. Usually, users will not want to access this property.
调用 outgoingMessage.end() 后，该属性将被清空。
¥After calling outgoingMessage.end(), this property will be nulled.