undefined

一、go http client 设置超时

1. http请求到完成响应的时间限制

client := http.Client{
	Timeout: 5*time.second,
}

这个超时是整个 Http 请求到完成响应的时间限制。

2. tcp 连接阶段的超时

client := http.Client{
	Transport: &http.Transport{
		Proxy: http.ProxyFromEnvironment,
		Dial: (&net.Dialer{
			Timeout:   2  * time.Second,
			Deadline:  time.Now().Add(3  * time.Second),
			KeepAlive: 2 * time.Second,
		}).Dial,
		TLSHandshakeTimeout: 2 * time.Second,
	},
	Timeout: 5 * time.Second,
}

设置 Transport 结构中的 Dial 属性来实现。

• Dial 的 timeout 是在 tcp 连接时设置的连接超时
• dealine 会在超过这个时间后强制关闭连接，这个在连接没有响应的时候会有用
• keepAlive 会发起心跳，检测连接是否存活。
• TLSHandshakeTimeout 作为 https 握手的超时
• Proxy 设置代理。http.ProxyFromEnvironment 表示根据环境变量来设置，即 http_proxy和https_proxy 两个变量设置的http代理
  • 如果强制不使用代理，可以设置为
  • Proxy: func(*http.Request)(*url.URL, error) {return nil,nil}

二、http client 实现

func main(){
	client := http.Client{
		Transport: &http.Transport{
			Dial: (&net.Dialer{
				Timeout: 2*time.Second,
				Deadline: time.Now().Add(2*time.Second),
			}).Dial,
		},
	}
	for {
		url_test := "http://10.186.225.124:80/monitor_test.cgi"
		//url_alignment := "http://shdev.receiver.barad.tencentyun.com/monitor_test.cgi"
		tm := time.Now().Unix()
		var dimension = DimensionStu{
			Appid:   "hello",
			Product: "hello",
			Uuid:    "hello",
		}
		//var batch = []BatchStu{{Unit: "mib", Name: "cpu", Value: 33.5}, {Unit: "mib", Name: "cpu", Value: 40.9}}
		var valData  = rand.Float64()*100
		var batch = []BatchStu{{Unit: "mib", Name: "cpu", Value: valData}}
		var oneData = []Data{{Timestamp: tm, Namespace: "qce/monitor_test", Dimension: dimension, Freq: 60, Batch: batch}}
		jsonStr, err := json.Marshal(oneData)
		if err != nil {
			panic(err)
		}
		req, err := http.NewRequest("POST", url_test, bytes.NewBuffer(jsonStr))
		if err != nil {
			panic(err)
		}
		req.Header.Set("Content-Type", "applicate/json")

		//spew.Dump(req)
		resp, err := client.Do(req)
		if err != nil {
			panic(err)
		}
		defer resp.Body.Close()
		body, _ := ioutil.ReadAll(resp.Body)
		fmt.Println(string(body))
		time.Sleep(1*time.Second)
	}
}