服务规范定义了协议中被连接的参与者所扮演的角色。
The service specification defines the roles that the connected participants play in the protocol.
（CURL 允许 PHP 应用程序使用各种协议连接至服务器）。
CURL allows PHP applications to use a variety of protocols to connect to servers.
所缺的明显的信息就是传输协议、连接格式、甚至是Web服务在网络上的位置。
Obvious things which are missing are the transport protocol, the wire format, and even the location on the network of the Web service.
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