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http、http1.0、http1.1、https、spdy、http2.0 浅对比总结 #60

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shiiiiiiji opened this issue Oct 27, 2018 · 0 comments

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shiiiiiiji commented Oct 27, 2018 •

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HTTP协议，基于TCP的一个传输协议。针对前端而言，一般有如下性能指标：

浏览器阻塞：对于同一个域名，同时只能有4个连接（因浏览器内核而异）
http://www.stevesouders.com/blog/2008/03/20/roundup-on-parallel-connections/
https://sanonz.github.io/2018/http-max-persistent-connections-per-server/
DNS查询：浏览器知道目标浏览器的IP才能建立连接，DNS查询是一个递归的过程。DNS缓存，CDN服务器返回最近的IP地址
建立连接：三次握手才能建立连接，才能携带请求报文

http1.1

缓存处理：http1.0只有Expires等缓存标准，http1.1引进了更多的缓存控制策略，ETag等
长连接：开启keep-alive

https

端口不同80/443
http直接基于tcp，传输的都是明文。https在http和tcp之间多了ssl/tls层，用于报文的加密
加密需要提前去CA申请证书
可有效防止运营商劫持

spdy/http2

多路复用：共享一个tcp连接
请求优先级
header压缩：两者算法不同
spdy强制使用https，http2支持http

shiiiiiiji changed the title ~~http、http1.1、https、spdy、http2.0~~ HTTP、HTTP 1.1、HTTPs、spdy、HTTP 2.0

shiiiiiiji changed the title ~~HTTP、HTTP 1.1、HTTPs、spdy、HTTP 2.0~~ HTTP、HTTP 1.1、HTTPs、spdy、HTTP 2.0 浅对比总结

shiiiiiiji changed the title ~~HTTP、HTTP 1.1、HTTPs、spdy、HTTP 2.0 浅对比总结~~ http、http1.0、http1.1、https、spdy、http2.0 浅对比总结

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