我用 Go 写了一个 URL 监控程序,但是一段时间后我发现在netstat -nao|grep 80.getHttpStatusCode 函数: HttpClient = &http.Client{ Transport: &http.Transport{ Dial: func(netw, addr string) (net.Conn, error) { deadline := time.Now().Add(30 * time.Second) c, err := net.DialTimeout(netw, addr, 20*time.Second) if err != nil { return nil, err } c.SetDeadline(deadline) c.SetReadDeadline(deadline) c.SetWriteDeadline(deadline) return c, nil }, }, }// ...func getHttpStatusCode(url string) int { if url == "" { return 200 } req, err := http.NewRequest("GET", url, nil) if err != nil { return 0 } req.Close = true req.Header.Add("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_3) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.57 Safari/537.17") resp, err := HttpClient.Do(req) if err != nil { return 0 } defer resp.Body.Close() return resp.StatusCode}我检查了 Go 手册,没有找到像 req.Close() 这样的东西,只是推迟了 resp.Body.Close()。这是输出netstat -nao | grep 80:tcp 1343352 0 192.168.2.33:29581 220.181.155.19:80 建立关闭 (0.00/0/0)和输出tcpdump tcp port 80:14:32:54.085095 IP 113.12.80.13.http > wk_0_mysql.KIDC90805.zw.39174: Flags [.], seq 17376:18824, ack 1, win 42, options [nop,nop,TS val 4236145017 ecr 204896351], length 144814:32:54.109206 IP wk_0_mysql.KIDC90805.zw.25834 > 220.181.90.8.http: Flags [S], seq 714805337, win 14600, options [mss 1460,sackOK,TS val 204896416 ecr 0,nop,wscale 9], length 014:32:54.223349 IP 220.181.155.22.http > wk_0_mysql.KIDC90805.zw.19262: Flags [.], seq 864939135:864940583, ack 1630899997, win 42, options [nop,nop,TS val 1570834172 ecr 204896529], length 1448
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