Hi guys: my question is how to reuse underlying TCP connection when doing a lot of frequent short HTTP requests using golang?
I tried things from stackoverflow and other blogs including: https://stackoverflow.com/questions/17948827/reusing-http-connections-in-golang https://awmanoj.github.io/tech/2016/12/16/keep-alive-http-requests-in-golang/ they say the key is to close resp.Body, here's my test code(as the answer from stackoverflow): // init HTTPClient func init() { httpClient = createHTTPClient() } const ( MaxIdleConnections int = 10 RequestTimeout int = 5 ) // createHTTPClient for connection re-use func createHTTPClient() *http.Client { client := &http.Client{ Transport: &http.Transport{ MaxIdleConnsPerHost: MaxIdleConnections, }, Timeout: time.Duration(RequestTimeout) * time.Second, } return client } func httpClientCode() { var endPoint string = "http://localhost:8080/doSomething"; for i := 0; i < 3; i++ { req, err := http.NewRequest("POST", endPoint, bytes.NewBuffer([]byte ("Post this data"))) if err != nil { log.Fatalf("Error Occured. %+v", err) } req.Header.Set("Content-Type", "application/x-www-form-urlencoded") response, err := httpClient.Do(req) if err != nil && response == nil { log.Fatalf("Error sending request to API endpoint. %+v", err) } else { io.Copy(ioutil.Discard, response.Body) response.Body.Close() } } } then I start a http server: python3 -m http.server 8080 and then i start package capture: sudo tcpdump -i lo -s 0 -w /tmp/p1.pcap dst port 8080 then run: go run main.go, i still got 3 times of TCP handshake, even after i change MaxIdleConnections to 1 <https://lh3.googleusercontent.com/-gbXW0h7LCvQ/Wsy4Rw8BzAI/AAAAAAAAANU/1F1n5nzl9IYw6fHAp0__kUGoM6UL6f_VQCLcBGAs/s1600/google_question.jpg> any thoughts? thx -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
