万维网的构成
万维网在现有的TCP和IP协议基础之上建立，由四个部分组成：
- HTML： A textual format to represent hypertext documents, the Hyper Text Markup Language.
- HTTP: A simple protocol to exchange these documents, the HypertText Transfer Protocol.
- client: A client to display (and accidentally edit) these documents, the first Web browser called WorldWideWeb.
- server: A server to give access to the document, an early version of httpd.
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