perf: further optimize http and body buffer handling

internal/watcher/health/monitor/agent_proxied.go

@@ -1,7 +1,7 @@
 package monitor
 
 import (
-	"errors"
+	"fmt"
 	"net/http"
 	"net/url"
 	"time"
@@ -9,6 +9,7 @@ import (
 	"github.com/bytedance/sonic"
 	agentPkg "github.com/yusing/godoxy/agent/pkg/agent"
 	"github.com/yusing/godoxy/internal/types"
+	httputils "github.com/yusing/goutils/http"
 )
 
 type (
@@ -62,17 +63,24 @@ func (mon *AgentProxiedMonitor) CheckHealth() (result types.HealthCheckResult, e
 
 	ctx, cancel := mon.ContextWithTimeout("timeout querying agent")
 	defer cancel()
-	data, status, err := mon.agent.DoHealthCheck(ctx, mon.endpointURL)
+	resp, err := mon.agent.DoHealthCheck(ctx, mon.endpointURL)
 	if err != nil {
 		return result, err
 	}
 
+	data, release, err := httputils.ReadAllBody(resp)
+	resp.Body.Close()
+	if err != nil {
+		return result, err
+	}
+	defer release(data)
+
 	endTime := time.Now()
-	switch status {
+	switch resp.StatusCode {
 	case http.StatusOK:
 		err = sonic.Unmarshal(data, &result)
 	default:
-		err = errors.New(string(data))
+		err = fmt.Errorf("HTTP %d %s", resp.StatusCode, data)
 	}
 	if err == nil && result.Latency != 0 {
 		// use godoxy to agent latency

internal/watcher/health/monitor/http.go

@@ -18,8 +18,15 @@ type HTTPHealthMonitor struct {
 
 var pinger = &http.Client{
 	Transport: &http.Transport{
-		DisableKeepAlives: true,
-		ForceAttemptHTTP2: false,
+		DisableKeepAlives:     true,
+		ForceAttemptHTTP2:     false,
+		TLSHandshakeTimeout:   3 * time.Second,
+		ResponseHeaderTimeout: 5 * time.Second,
+		TLSClientConfig: &tls.Config{
+			InsecureSkipVerify: true,
+		},
+		MaxIdleConnsPerHost: 1,
+		IdleConnTimeout:     10 * time.Second,
 	},
 	CheckRedirect: func(r *http.Request, via []*http.Request) error {
 		return http.ErrUseLastResponse
@@ -51,13 +58,16 @@ func (mon *HTTPHealthMonitor) CheckHealth() (types.HealthCheckResult, error) {
 		return types.HealthCheckResult{}, err
 	}
 	req.Close = true
-	req.Header.Set("Connection", "close")
 	req.Header.Set("User-Agent", "GoDoxy/"+version.Get().String())
+	req.Header.Set("Accept", "text/plain,text/html,*/*;q=0.8")
+	req.Header.Set("Accept-Encoding", "identity")
+	req.Header.Set("Cache-Control", "no-cache")
+	req.Header.Set("Pragma", "no-cache")
 
 	start := time.Now()
 	resp, respErr := pinger.Do(req)
 	if respErr == nil {
-		defer resp.Body.Close()
+		resp.Body.Close()
 	}
 
 	lat := time.Since(start)