1.13 Go HTTP服务器性能优化：连接池、超时控制、优雅关闭实战技巧引言生产环境的HTTP服务器需要高性能和高可用性。本文将深入讲解连接池、超时控制、优雅关闭等性能优化技巧，帮助你构建高性能的HTTP服务器。一、HTTP客户端连接池1.1 默认HTTP客户端的问题packagemainimport("net/http""time")// 问题：每次请求都创建新连接funcbadExample(){resp,err:=http.Get("https://www.example.com")// ...}1.2 配置连接池packagemainimport("net/http""time")funccreateHTTPClient()*http.Client{transport:=http.Transport{MaxIdleConns:100,// 最大空闲连接数MaxIdleConnsPerHost:10,// 每个主机的最大空闲连接数IdleConnTimeout:90*time.Second,// 空闲连接超时DisableKeepAlives:false,// 启用Keep-Alive}client:=http.Client{Transport:transport,Timeout:10*time.Second,// 请求超时}returnclient}funcmain(){client:=createHTTPClient()// 复用连接fori:=0;i100;i++{resp,err:=client.Get("https://www.example.com")iferr!=nil{continue}resp.Body.Close()}}二、HTTP服务器优化2.1 配置服务器参数packagemainimport("net/http""time")funccreateServer()*http.Server{returnhttp.Server{Addr:":8080",ReadTimeout:15*time.Second,// 读取超时WriteTimeout:15*time.Second,// 写入超时IdleTimeout:60*time.Second,// 空闲连接超时// 连接管理MaxHeaderBytes:120,// 1MB// 启用HTTP/2// TLSNextProto: make(map[string]func(*http.Server, *tls.Conn, http.Handler)),}}funcmain(){server:=createServer()http.HandleFunc("/",func(w http.ResponseWriter,r*http.Request){w.Write([]byte("OK"))})server.ListenAndServe()}2.2 连接限制packagemainimport("net/http""sync")typeLimitedServerstruct{maxConnsintcurrentintmu sync.Mutex cond*sync.Cond}funcNewLimitedServer(maxConnsint)*LimitedServer{ls:=LimitedServer{maxConns:maxConns,}ls.cond=sync.NewCond(ls.mu)returnls}func(ls*LimitedServer)ServeHTTP(w http.ResponseWriter,r*http.Request){// 获取连接ls.mu.Lock()forls.current=ls.maxConns{ls.cond.Wait()}ls.current++ls.mu.Unlock()// 处理请求deferfunc(){ls.mu.Lock()ls.current--ls.cond.Signal()ls.mu.Unlock()}()// 实际处理逻辑w.Write([]byte("OK"))}funcmain(){server:=NewLimitedServer(100)http.ListenAndServe(":8080",server)}三、超时控制3.1 请求超时packagemainimport("context""net/http""time")funchandlerWithTimeout(w http.ResponseWriter,r*http.Request){// 创建带超时的contextctx,cancel:=context