Agent-driven negotiation is new and allows the user agent (possibly with help from the user) to choose the best representation out of a list supplied by the server.

代理驱动的协商是新出现的，它允许用户代理(可能需要用户的帮助)从服务器提供的列表中选择最佳表示方式。

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The User-Agent header can also be used for content negotiation.

User - Agent标头也可用于内容协商。

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With agent-driven negotiation, the user agent selects the best representation for a response after it receives an initial response from the origin server.

利用代理驱动的协商，用户代理可以在从原始服务器中接收最初响应后为该响应选择最佳表示形式。

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Manning, not previously involved in any bargaining, is scheduled to become a free agent, pending the negotiation of the Franchise tag application between the two sides.

FORBES: Reasons To Have Faith In the NFL's Labor Talks

If a team gets a sense that the agent is planning a difficult negotiation it can point them in a different direction.

FORBES: How To Be A Great Sports Agent: Part Four