[knowledge][http] http

关于，底层承载协议的规定。

   HTTP communication usually takes place over TCP/IP connections. The
   default port is TCP 80 [19], but other ports can be used. This does
   not preclude HTTP from being implemented on top of any other protocol
   on the Internet, or on other networks. HTTP only presumes a reliable
   transport; any protocol that provides such guarantees can be used;
   the mapping of the HTTP/1.1 request and response structures onto the
   transport data units of the protocol in question is outside the scope
   of this specification.

https://zh.wikipedia.org/wiki/%E8%B6%85%E6%96%87%E6%9C%AC%E4%BC%A0%E8%BE%93%E5%8D%8F%E8%AE%AE

https://tools.ietf.org/html/rfc2616

HTTP: The Definitive Guide: The Definitive Guide: 

https://books.google.com/books?id=qEoOl9bcV_cC&lpg=PT33&ots=zymVTvQt7m&dq=joes-hardware%20http&hl=zh-CN&pg=PP1#v=onepage&q&f=false

URL:

基于《HTTP: The Definitive Guide: The Definitive Guide》 中对URL的定义，如下URL中的逗号，属于那个一部分呢？ 资源名的一部分？

https://ark.intel.com/compare/88182,75054,88174

答案是 path（路径），资源名称也是路径的一部分。