func getTrace() {
req, err := http.NewRequest("GET", "https://aphro-api.appspot.com/v1/articles", nil)
if err != nil {
log.Fatal(err)
}
// Set hooks
trace := httptrace.ClientTrace{
GetConn: func(h string) {
log.Println("GetConn:", h)
},
}
ctx := httptrace.WithClientTrace(context.Background(), &trace)
req = req.WithContext(ctx)
client := http.DefaultClient
res, err := client.Do(req)
if err != nil {
log.Fatal(err)
}
defer res.Body.Close()
j, err := simplejson.NewFromReader(res.Body)
if err != nil {
log.Fatal(err)
}
pp.Println(j)
}
func ExampleTrace() {
req, _ := http.NewRequest("GET", "http://example.com", nil)
trace := &httptrace.ClientTrace{
GotConn: func(connInfo httptrace.GotConnInfo) {
fmt.Printf("Got Conn: %+v\n", connInfo)
},
DNSDone: func(dnsInfo httptrace.DNSDoneInfo) {
fmt.Printf("DNS Info: %+v\n", dnsInfo)
},
}
req = req.WithContext(httptrace.WithClientTrace(req.Context(), trace))
http.DefaultClient.Do(req)
}
func main() {
traceCtx := httptrace.WithClientTrace(context.Background(), &httptrace.ClientTrace{
GetConn: func(hostPort string) {
fmt.Printf("Prepare to get a connection for %s.\n", hostPort)
},
GotConn: func(info httptrace.GotConnInfo) {
fmt.Printf("Got a connection: reused: %v, from the idle pool: %v.\n",
info.Reused, info.WasIdle)
},
PutIdleConn: func(err error) {
if err == nil {
fmt.Println("Put a connection to the idle pool: ok.")
} else {
fmt.Println("Put a connection to the idle pool:", err.Error())
}
},
ConnectStart: func(network, addr string) {
fmt.Printf("Dialing... (%s:%s).\n", network, addr)
},
ConnectDone: func(network, addr string, err error) {
if err == nil {
fmt.Printf("Dial is done. (%s:%s)\n", network, addr)
} else {
fmt.Printf("Dial is done with error: %s. (%s:%s)\n", err, network, addr)
}
},
WroteRequest: func(info httptrace.WroteRequestInfo) {
if info.Err == nil {
fmt.Println("Wrote a request: ok.")
} else {
fmt.Println("Wrote a request:", info.Err.Error())
}
},
GotFirstResponseByte: func() {
fmt.Println("Got the first response byte.")
},
})
req, err := http.NewRequest("GET", "http://www.baidu.com/", nil)
if err != nil {
log.Fatal("Fatal error:", err)
}
req = req.WithContext(traceCtx)
_, err = http.DefaultClient.Do(req)
if err != nil {
fmt.Fprintf(os.Stderr, "Request error: %v\n", err)
os.Exit(1)
}
}
func Example() {
req, _ := http.NewRequest("GET", "http://example.com", nil)
trace := &httptrace.ClientTrace{
GotConn: func(connInfo httptrace.GotConnInfo) {
fmt.Printf("Got Conn: %+v\n", connInfo)
},
DNSDone: func(dnsInfo httptrace.DNSDoneInfo) {
fmt.Printf("DNS Info: %+v\n", dnsInfo)
},
}
req = req.WithContext(httptrace.WithClientTrace(req.Context(), trace))
_, err := http.DefaultTransport.RoundTrip(req)
if err != nil {
log.Fatal(err)
}
}