12.1 服务器驱动协商（Server-driven Negotiation）如果响应的最好的表现形式的选择是通过服务器上的算法来实现，那么这种方式的协商称做服务器驱动协商。
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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。
With agent-driven negotiation, the user agent selects the best representation for a response after it receives an initial response from the origin 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。
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.
透明协商是服务器驱动的协商与代理驱动的协商的组合。
Transparent negotiation is a combination of both server-driven and agent-driven negotiation.
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