fasthttp：一个比官方net/http 快10 倍的http server

Fast HTTP implementation for Go.

Currently fasthttp is successfully used in a production serving up to 1M concurrent keep-alive connections doing 50K qps from a single server.

In short, fasthttp is up to 10 times faster than net/http.

项目地址 https://github.com/valyala/fasthttp

跟标准库比，在下面四个方面得到改进：

net/http 的实现是一个连接新建一个 goroutine；fasthttp 是利用一个 worker 复用 goroutine，减轻 runtime 调度 goroutine 的压力
net/http 解析的请求数据很多放在 map[string]string(http.Header) 或 map[string][]string(http.Request.Form)，有不必要的 []byte 到 string 的转换，是可以规避的
net/http 解析 HTTP 请求每次生成新的 *http.Request 和 http.ResponseWriter; fasthttp 解析 HTTP 数据到 *fasthttp.RequestCtx，然后使用 sync.Pool 复用结构实例，减少对象的数量
fasthttp 会延迟解析 HTTP 请求中的数据，尤其是 Body 部分。这样节省了很多不直接操作 Body 的情况的消耗

这家伙写了好多'fast' 系列：

fasthttp: Fast HTTP package for Go
ybc: Fast in-process BLOB cache with persistence support
gorpc: Simple, fast and scalable golang rpc library for high load
goloris: Slowloris for nginx DoS. Written in go
gheap: Fast generalized heap tree algorithms in C++ and C. Provides simultaneous support for D-heap and B-heap.