Web browsers are the most commonly used type of HTTP user agent.

Web浏览器是最常用类型的HTTP用户代理。

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You read the HTTP Accept header, and set the MIME type depending on the capabilities of the user agent.

你读取HTTP Accept头信息，按照用户代理程序的兼容性设置MIME类型。

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A virtual search agent could use Web servers and HTTP interfaces to both perceive and manipulate the environment (the Internet) and a console as an effector to communicate with a user.

而虚拟搜索代理则可以使用Web服务器和HTTP接口来感知环境(Internet)并对环境进行操作，并使用一个终端作为效应器来与用户进行通信。

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