outgoingMessage.socket
引用底层套接字。通常，用户不希望访问此属性。
🌐 Reference to the underlying socket. Usually, users will not want to access this property.
在调用 outgoingMessage.end() 之后，该属性将被置为空。
🌐 After calling outgoingMessage.end(), this property will be nulled.
引用底层套接字。通常，用户不希望访问此属性。
🌐 Reference to the underlying socket. Usually, users will not want to access this property.
在调用 outgoingMessage.end() 之后，该属性将被置为空。
🌐 After calling outgoingMessage.end(), this property will be nulled.