HTTP，HTTP/2协议的规范的发展记录
HTTP的记录大全：https://www.w3.org/Protocols/
Tomcat支持的HTTP协议：TOMCAT/Specifications
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HTTP 0.9 |
（最初版本的HTTP协议）The Original HTTP as defined in 1991 at W3.org |
|
HTTP/1.0 |
RFC 1945 |
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HTTP/1.1 |
RFC 2068 (1997 1月) - 弃用, 被 RFC 2616 替代 RFC 7230 (2014 6月) - 消息格式与路由（Message Syntax and Routing） |
| HTTP/2 |
RFC 7540 (2015 5月) - Hypertext Transfer Protocol Version 2 (HTTP/2) HTTP/2 home page, maintained by the IETF HTTPbis Working Group |
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