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測(cè)試代碼（默認(rèn)MaxIdleConns=100, MaxIdleConnsPerHost=2）
package main
import (
"io"
"io/ioutil"
"net/http"
"time"
)
func worker(client *http.Client) {
resp, _ := client.Get("[http://www.qq.com/"](http://192.168.31.1/%22);)
io.Copy(ioutil.Discard, resp.Body)
defer resp.Body.Close()
}
func worker2(client *http.Client) {
resp, _ := client.Get("[http://httpbin.org/get"](http://httpbin.org/get%22);)
io.Copy(ioutil.Discard, resp.Body) //必須讀取Body并且關(guān)閉，否者不會(huì)被復(fù)用
defer resp.Body.Close()
}
func main() {
tr := &http.Transport{
MaxIdleConns: 100,
MaxIdleConnsPerHost: 2,
}
client := &http.Client{
Transport: tr,
}
worker(client)
time.Sleep(time.Second * 1)
worker(client)
time.Sleep(time.Second * 1)
worker2(client)
time.Sleep(time.Second * 1)
worker(client)
time.Sleep(time.Second * 1)
}
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設(shè)置MaxIdleConns=MaxIdleConnsPerHost=1
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Client第一次請(qǐng)求，源端口是55564
image.png -
Client第二次請(qǐng)求淹真，源端口是55564
image.png -
Client第三次請(qǐng)求，源端口是55556
image.png -
Client第四次請(qǐng)求挨决，源端口是55568
image.png
Client前兩個(gè)請(qǐng)求對(duì)同一個(gè)host發(fā)起弥喉，復(fù)用了55564接口的鏈接允青，第三次請(qǐng)求對(duì)另外一個(gè)HOST發(fā)起，由于MaxIdleConns=1蒋得，會(huì)關(guān)閉前一個(gè)鏈接然后發(fā)起一個(gè)新的鏈接级及，第四次同樣也會(huì)關(guān)閉第三次的鏈接，重新發(fā)起窄锅。說(shuō)明MaxIdleConns限制了最大keep-alive的連接數(shù)创千，超出的連接會(huì)被關(guān)閉掉缰雇。
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設(shè)置MaxIdleConns=2 MaxIdleConnsPerHost=1
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Client第一次請(qǐng)求入偷，源端口是55680
image.png -
Client第二次請(qǐng)求，源端口是55680
image.png -
Client第三次請(qǐng)求械哟，源端口是55681
image.png -
Client 第四次請(qǐng)求疏之，源端口是55680
image.png
Client對(duì)不同的兩個(gè)Host發(fā)起的請(qǐng)求，都復(fù)用了連接
