If present, this value indicates the protocol-level extension (s) the client wishes to speak.

这个值代表客户端计划使用的协议级别扩展信息。

youdao

Implements a modification or extension of the client across a contract.

实作合约上用户端的修改或延伸。

youdao

Implements a modification or extension of the client across a contract.

实作合约上用户端的修改或延伸。

youdao