RPC的ClientCodec和ServerCodec接口，可用于rpc包。</p>
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        <li><a href="#Dial">func Dial(network, address string) (*rpc.Client, error)</a></li>
        <li><a href="#NewClient">func NewClient(conn io.ReadWriteCloser) *rpc.Client</a></li>
        <li><a href="#NewClientCodec">func NewClientCodec(conn io.ReadWriteCloser) rpc.ClientC