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Update HTTP #267

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Update HTTP #267

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21 changes: 21 additions & 0 deletions notes/HTTP.md
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Expand Up @@ -1011,12 +1011,33 @@ DELETE /idX/delete HTTP/1.1 -> Returns 404
# 九、HTTP/1.0 与 HTTP/1.1 的区别

- HTTP/1.1 默认是持久连接

一个TCP连接可以传送多个HTTP请求和响应，减少了建立和关闭TCP连接所需要的消耗

- HTTP/1.1 支持管线化处理

管道可以让我们把 FIFO 队列从客户端（请求队列）迁移到服务器（响应队列），即客户端可以并行，服务端串行。客户端可以不用等待前一个请求返回，发送请求，但服务器端必须顺序的返回客户端的请求响应结果

- HTTP/1.1 支持多个TCP连接

允许并行打开多个TCP会话（一般是4到8），客户端可以并行发送最多N个请求，服务端可以同时处理N个请求，以提高传输的效率

- HTTP/1.1 支持虚拟主机

使得一台服务器拥有多个域名，并且在逻辑上可以看成多个服务器

- HTTP/1.1 新增状态码 100

用于客户端询问是否可以在后续的请求中发送附件

- HTTP/1.1 支持分块传输编码

允许HTTP由应用服务器发送给客户端的数据可以分成多个部分，这样服务器可以发送数据而不需要预先知道发送内容的总大小，允许服务器在最后发送消息头字段

- HTTP/1.1 新增缓存处理指令 max-age

表示资源能够被缓存的最大时间

# 十、HTTP/2.0

## HTTP/1.x 缺陷
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