HTTP 重用 go HTTP connection reused

In order to let the client reuse the underlying connection we just need to read the body entirely and close it before we issue a new HTTP request.

package main

import (
    "context"
    "io"
    "io/ioutil"
    "log"
    "net/http"
    "net/http/httptrace"
)

func main() {
    // client trace to log whether the request's underlying tcp connection was re-used
    clientTrace := &httptrace.ClientTrace{
        GotConn: func(info httptrace.GotConnInfo) { log.Printf("conn was reused: %t", info.Reused) },
    }
    traceCtx := httptrace.WithClientTrace(context.Background(), clientTrace)

    // 1st request
    req, err := http.NewRequestWithContext(traceCtx, http.MethodGet, "http://example.com", nil)
    if err != nil {
        log.Fatal(err)
    }
    res, err := http.DefaultClient.Do(req)
    if err != nil {
        log.Fatal(err)
    }
    if _, err := io.Copy(ioutil.Discard, res.Body); err != nil {
        log.Fatal(err)
    }
    res.Body.Close()
    // 2nd request
    req, err = http.NewRequestWithContext(traceCtx, http.MethodGet, "http://example.com", nil)
    if err != nil {
        log.Fatal(err)
    }
    _, err = http.DefaultClient.Do(req)
    if err != nil {
        log.Fatal(err)
    }
}

go http 参数设置示例

newClient := &http.Client{

        Timeout: time.Minute * 1, //设置超时时间

        Transport: &http.Transport{

            Dial: (&net.Dialer{

                Timeout:   30 * time.Second, //限制建立TCP连接的时间

                KeepAlive: 30 * time.Second,

            }).Dial,

            TLSHandshakeTimeout:   10 * time.Second, //限制 TLS握手的时间

            ResponseHeaderTimeout: 10 * time.Second, //限制读取response header的时间,默认 timeout + 5*time.Second

            ExpectContinueTimeout: 1 * time.Second,  //限制client在发送包含 Expect: 100-continue的header到收到继续发送body的response之间的时间等待。

            MaxIdleConns:          2,                //所有host的连接池最大连接数量，默认无穷大

            MaxIdleConnsPerHost:   1,                //每个host的连接池最大空闲连接数,默认2

            MaxConnsPerHost:       1,                //每个host的最大连接数量

            IdleConnTimeout:       3 * time.Minute,  //how long an idle connection is kept in the connection pool.
            TLSClientConfig:     &tls.Config{InsecureSkipVerify: true},

        },

    }

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