golang http连接复用方法

Laila ·

更新时间:2024-09-20

· 842 次阅读

server端

golang httpserver 默认开启keepalive连接复用选项

handler函数需要完整读body数据，构造返回消息，否则当数据不能一次发送完成时，连接复用就会失效。

示例如下


package main
import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"strconv"
	"strings"
	"time"
)
func connHandler(w http.ResponseWriter, r *http.Request) {
	// parse
	r.ParseForm()
	response_time := r.Header.Get("sleep-time")
	// <= NOTE
	if _, err := ioutil.ReadAll(r.Body); err != nil {
		http.Error(w, err.Error(), 500)
		return
	}
	defer r.Body.Close()
	// sleep for some time
	resp_time := 1
	if response_time != "" {
		ms, _ := strconv.ParseFloat(response_time, 64)
		resp_time = (int)(ms * 1000)
	}
	time.Sleep(time.Duration(resp_time) * time.Millisecond)
	// parepare response
	status := 200
	body := ""
	w.Header().Set("Content-Type", "text/plain")
	w.Header().Set("Content-Length", strconv.Itoa(len(body)))
	w.WriteHeader(status)
	w.Write([]byte(body))
}
func main() {
	http.HandleFunc("/", connHandler)
	if err := http.ListenAndServe(":server_port", nil); err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}

client 端

客户端需要构建全局client，完整读 response body，并关闭body


package main
import (
  "bytes"
  "fmt"
  "io"
  "io/ioutil"
  "log"
  "net/http"
  "time"
)
var (
  httpClient *http.Client
)
const (
  MaxIdleConnections int = 20
  RequestTimeout   int = 30
)
// init HTTPClient
func init() {
  httpClient = createHTTPClient()
}
// createHTTPClient for connection re-use
func createHTTPClient() *http.Client {
  client := &http.Client{
   Transport: &http.Transport{
      MaxIdle  ConnsPerHost: MaxIdleConnections,
 },
 Timeout: time.Duration(RequestTimeout) * time.Second,
  }
  return client
}
func conn_reuse_post(conn_reuse_times int) {
  var endPoint string = "http://server_ip:server_port/"
  data := []byte{}
  // fill data 
  for i := 0; i < conn_reuse_times; i++ {
 // use global httpClient to send request
 resp, err := httpClient.Post(endPoint, "application/x-www-form-urlencoded", bytes.NewBuffer([]byte(data)))
 fmt.Println(resp)
 if err != nil {
   log.Println("err", err)
   return
 }
 io.Copy(ioutil.Discard, resp.Body) // <= NOTE
 resp.Body.Close()  // <= NOTE
  }
}
func main() {
  conn_reuse_post(5)
}

以上这篇golang http连接复用方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持软件开发网。

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