追蹤客戶端請(qǐng)求各階段
package main
import (
"fmt"
"net/http"
"net/http/httptrace"
"log"
"io/ioutil"
)
func main() {
req, _ := http.NewRequest("GET", "http://example.com", nil)
// 創(chuàng)建客戶端請(qǐng)求跟蹤
trace := &httptrace.ClientTrace{
GotConn: func(connInfo httptrace.GotConnInfo) {
fmt.Printf("Got Conn: %+v\n", connInfo)
},
DNSStart: func(info httptrace.DNSStartInfo) {
fmt.Println(info.Host)
},
ConnectStart: func(network, addr string) {
fmt.Println(network)
fmt.Println(addr)
},
DNSDone: func(dnsInfo httptrace.DNSDoneInfo) {
fmt.Printf("DNS Info: %+v\n", dnsInfo)
},
}
// 請(qǐng)求追蹤
req = req.WithContext(httptrace.WithClientTrace(req.Context(), trace))
resp, err := http.DefaultTransport.RoundTrip(req)
if err != nil {
log.Fatal(err)
}
data,_ := ioutil.ReadAll(resp.Body)
fmt.Println(string(data))
}
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