您需要创建自己的
net.Dialer，并返回，以
net.Conn设置适当的读写期限。
该
Conn会是这个样子：
// Conn wraps a net.Conn, and sets a deadline for every read// and write operation.type Conn struct { net.Conn ReadTimeout time.Duration WriteTimeout time.Duration}func (c *Conn) Read(b []byte) (int, error) { err := c.Conn.SetReadDeadline(time.Now().Add(c.ReadTimeout)) if err != nil { return 0, err } return c.Conn.Read(b)}func (c *Conn) Write(b []byte) (int, error) { err := c.Conn.SetWriteDeadline(time.Now().Add(c.WriteTimeout)) if err != nil { return 0, err } return c.Conn.Write(b)}
