The Hypertext Transfer Protocol , the Web's (请作答此空) protocol , is at the heart of the Web. HTTP is implemented in two programs : a ( ) program and a server program . The client program and server program executing on different end systems , talk to each other by ( ) HTTP messages . HTTP defines how Web clients request Web pages from servers and how servers transfer web pages to clients . when a user ( ) a web page , the browser sends http request messages for the objects in the page to the server . The server ( ) the requests and responds with http response messages that contain the objects .

transport-layer

application-layer

network-layer

link-layer

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答案：

解析：

题目中提到的协议位于Web的核心，并且描述了HTTP如何在客户端程序和服务器程序中实现。根据提供的参考答案和解析，Web的应用层协议是超文本传输协议（HTTP），因此正确答案为B，即application-layer。其他选项如transport-layer、network-layer和link-layer都与Web的核心协议HTTP不直接相关。

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本文链接：The Hypertext Transfer Protocol , the Web's (请作答此空

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