diff --git a/internal/metrics/metrics.go b/internal/metrics/metrics.go
index 105637d..a9f6f4f 100644
--- a/internal/metrics/metrics.go
+++ b/internal/metrics/metrics.go
@@ -1,7 +1,6 @@
 package metrics
 
 import (
-	"sync"
 	"sync/atomic"
 	"time"
 )
@@ -10,13 +9,12 @@ import (
 // 只针对转发请求调用 Inc。
 
 type bucket struct {
-	second int64 // Unix 秒
-	count  int64
+	second atomic.Int64 // Unix 秒
+	count  atomic.Int64
 }
 
 var (
 	buckets [60]bucket
-	mu      sync.Mutex
 	total   atomic.Int64
 )
 
@@ -24,14 +22,18 @@ var (
 func Inc() {
 	now := time.Now().Unix()
 	idx := now % 60
-	mu.Lock()
 	b := &buckets[idx]
-	if b.second != now { // 该槽位属于旧秒，重置
-		b.second = now
-		b.count = 0
+	for {
+		sec := b.second.Load()
+		if sec == now {
+			b.count.Add(1)
+			break
+		}
+		if b.second.CompareAndSwap(sec, now) {
+			b.count.Store(1)
+			break
+		}
 	}
-	b.count++
-	mu.Unlock()
 	total.Add(1)
 }
 
@@ -39,10 +41,8 @@ func Inc() {
 func QPS() int64 {
 	now := time.Now().Unix()
 	idx := now % 60
-	mu.Lock()
-	b := buckets[idx]
-	mu.Unlock()
-	if b.second == now { return b.count }
+	b := &buckets[idx]
+	if b.second.Load() == now { return b.count.Load() }
 	return 0
 }
 
@@ -50,14 +50,12 @@ func QPS() int64 {
 func QPM() int64 {
 	now := time.Now().Unix()
 	var sum int64
-	mu.Lock()
-	for i := 0; i < 60; i++ {
-		b := buckets[i]
-		if now-b.second < 60 { // 在窗口内
-			sum += b.count
+	for i := range 60 {
+		sec := buckets[i].second.Load()
+		if sec <= now && now-sec < 60 { // 在窗口内
+			sum += buckets[i].count.Load()
 		}
 	}
-	mu.Unlock()
 	return sum
 }
 
diff --git a/internal/middleware/metrics.go b/internal/middleware/metrics.go
index 1db8e69..f513feb 100644
--- a/internal/middleware/metrics.go
+++ b/internal/middleware/metrics.go
@@ -1,127 +1,23 @@
 package middleware
 
 import (
-	"sync/atomic"
 	"time"
 
 	"github.com/gin-gonic/gin"
+
+	"anyproxy/internal/metrics"
 )
 
-// 简易 QPS / QPM 统计：使用滑动窗口环形数组按秒/按分钟聚合
-// secondBuckets: 最近 60 秒每秒的请求计数
-// minuteBuckets: 最近 60 分钟每分钟的请求计数
-
-var (
-	secondBuckets [60]atomic.Int64
-	minuteBuckets [60]atomic.Int64
-	lastSecond int64
-	lastMinute int64
-	// 总请求数 (复用可选)
-	totalRequests atomic.Int64
-)
-
-func init() {
-	now := time.Now()
-	lastSecond = now.Unix()
-	lastMinute = now.Unix() / 60
-}
-
-// AddRequest 在收到一个请求时调用，通常在请求完成后计数
-func AddRequest() {
-	now := time.Now()
-	sec := now.Unix()
-	min := sec / 60
-
-	// 处理秒级 bucket
-	oldSec := atomic.LoadInt64(&lastSecond)
-	if sec != oldSec {
-		// 跨秒：清理可能跨越多个秒的间隙
-		if atomic.CompareAndSwapInt64(&lastSecond, oldSec, sec) {
-			steps := int(sec - oldSec)
-			if steps > 60 { steps = 60 }
-			for i := 1; i <= steps; i++ {
-				idx := int((oldSec+int64(i)) % 60)
-				secondBuckets[idx].Store(0)
-			}
-		}
-	}
-	secIdx := int(sec % 60)
-	secondBuckets[secIdx].Add(1)
-
-	// 处理分钟级 bucket
-	oldMin := atomic.LoadInt64(&lastMinute)
-	if min != oldMin {
-		if atomic.CompareAndSwapInt64(&lastMinute, oldMin, min) {
-			steps := int(min - oldMin)
-			if steps > 60 { steps = 60 }
-			for i := 1; i <= steps; i++ {
-				idx := int((oldMin+int64(i)) % 60)
-				minuteBuckets[idx].Store(0)
-			}
-		}
-	}
-	minIdx := int(min % 60)
-	minuteBuckets[minIdx].Add(1)
-
-	totalRequests.Add(1)
-}
-
-// CurrentQPS 返回最近 1 秒（当前秒）的请求数
-func CurrentQPS() int64 {
-	sec := time.Now().Unix()
-	if sec != atomic.LoadInt64(&lastSecond) { return 0 }
-	return secondBuckets[sec%60].Load()
-}
-
-// AvgQPSRecent60 返回最近 60 秒平均 QPS
-func AvgQPSRecent60() float64 {
-	sec := time.Now().Unix()
-	total := int64(0)
-	last := atomic.LoadInt64(&lastSecond)
-	for i := 0; i < 60; i++ {
-		// 只统计在窗口内(未被清零)的 bucket
-		bucketSec := sec - int64(i)
-		if bucketSec <= last && last-bucketSec < 60 {
-			idx := bucketSec % 60
-			total += secondBuckets[idx].Load()
-		}
-	}
-	return float64(total) / 60.0
-}
-
-// CurrentQPM 返回当前分钟的请求数
-func CurrentQPM() int64 {
-	min := time.Now().Unix() / 60
-	if min != atomic.LoadInt64(&lastMinute) { return 0 }
-	return minuteBuckets[min%60].Load()
-}
-
-// AvgQPMRecent60 返回最近 60 分钟的平均 QPM
-func AvgQPMRecent60() float64 {
-	min := time.Now().Unix() / 60
-	total := int64(0)
-	last := atomic.LoadInt64(&lastMinute)
-	for i := 0; i < 60; i++ {
-		bucketMin := min - int64(i)
-		if bucketMin <= last && last-bucketMin < 60 {
-			idx := bucketMin % 60
-			total += minuteBuckets[idx].Load()
-		}
-	}
-	return float64(total) / 60.0
-}
-
-// TotalRequests 返回总请求量（从进程启动以来）
-func TotalRequests() int64 { return totalRequests.Load() }
-
 // MetricsHandler 输出当前指标
 func MetricsHandler(c *gin.Context) {
+	qps := metrics.QPS()
+	qpm := metrics.QPM()
 	c.JSON(200, gin.H{
-		"qps_current": CurrentQPS(),
-		"qps_avg_60s": AvgQPSRecent60(),
-		"qpm_current": CurrentQPM(),
-		"qpm_avg_60m": AvgQPMRecent60(),
-		"total":       TotalRequests(),
+		"qps_current": qps,
+		"qps_avg_60s": float64(qpm) / 60.0,
+		"qpm_current": qpm,
+		"qpm_avg_60m": float64(qpm),
+		"total":       metrics.Total(),
 		"timestamp":   time.Now().Unix(),
 	})
 }
diff --git a/internal/middleware/requestid.go b/internal/middleware/requestid.go
index 75a1654..727a236 100644
--- a/internal/middleware/requestid.go
+++ b/internal/middleware/requestid.go
@@ -1,7 +1,7 @@
 package middleware
 
 import (
-	"fmt"
+	"strconv"
 	"sync/atomic"
 
 	"github.com/gin-gonic/gin"
@@ -16,7 +16,7 @@ func RequestID() gin.HandlerFunc {
 	return func(c *gin.Context) {
 		id := globalReqID.Add(1)
 		c.Set(RequestIDKey, id)
-		c.Writer.Header().Set("X-Request-ID", fmt.Sprintf("%d", id))
+		c.Writer.Header().Set("X-Request-ID", strconv.FormatInt(id, 10))
 		c.Next()
 	}
 }
diff --git a/internal/proxy/proxy.go b/internal/proxy/proxy.go
index 8f1bde3..39e41fa 100644
--- a/internal/proxy/proxy.go
+++ b/internal/proxy/proxy.go
@@ -6,9 +6,9 @@ import (
 	"fmt"
 	"io"
 	"log/slog"
-	"mime"
 	"net/http"
 	"strings"
+	"sync"
 	"sync/atomic"
 
 	"github.com/gin-gonic/gin"
@@ -20,6 +20,10 @@ import (
 // 转发的总请求计数器
 var totalForwarded atomic.Int64
 
+var copyBufPool = sync.Pool{
+	New: func() any { return make([]byte, 32*1024) },
+}
+
 // Proxy 封装具体的转发逻辑
 type Proxy struct {
 	Client *http.Client
@@ -73,8 +77,10 @@ func (p *Proxy) forward(c *gin.Context, target string) {
 		return
 	}
 	upReq.Header = c.Request.Header.Clone()
-
-	// 仅在 SSE 时禁用压缩；稍后检测
+	if strings.Contains(strings.ToLower(c.GetHeader("Accept")), "text/event-stream") {
+		// SSE 禁用压缩
+		upReq.Header.Del("Accept-Encoding")
+	}
 
 	resp, err := p.Client.Do(upReq)
 	if err != nil {
@@ -87,15 +93,14 @@ func (p *Proxy) forward(c *gin.Context, target string) {
 	// 仅在真正进行了一次上游转发并得到响应后计数
 	metrics.Inc()
 
-	mediaType, _, _ := mime.ParseMediaType(resp.Header.Get("Content-Type"))
-	isSSE := mediaType == "text/event-stream"
+	contentType := strings.ToLower(resp.Header.Get("Content-Type"))
+	isSSE := strings.HasPrefix(contentType, "text/event-stream")
 
 	p.Log.Debug("上游响应", "req_id", reqID, "status", resp.StatusCode, "sse", isSSE)
 
-	// 复制上游响应头（最小化过滤）
-	for k, vs := range resp.Header {
-		for _, v := range vs { c.Header(k, v) }
-	}
+	// 复制上游响应头
+	dstHeader := c.Writer.Header()
+	for k, vs := range resp.Header { dstHeader[k] = vs }
 	if isSSE {
 		c.Writer.Header().Del("Content-Length")
 		c.Writer.Header().Del("Transfer-Encoding")
@@ -103,14 +108,15 @@ func (p *Proxy) forward(c *gin.Context, target string) {
 		c.Header("Cache-Control", "no-cache")
 		c.Header("Connection", "keep-alive")
 		c.Header("X-Accel-Buffering", "no")
-		// 确保禁用上游压缩避免 SSE 事件被聚合
-		upReq.Header.Del("Accept-Encoding")
 	}
 	c.Status(resp.StatusCode)
 	if f, ok := c.Writer.(http.Flusher); ok { f.Flush() }
 
 	if !isSSE {
-		if _, err := io.Copy(c.Writer, resp.Body); err != nil {
+		buf := copyBufPool.Get().([]byte)
+		_, err := io.CopyBuffer(c.Writer, resp.Body, buf)
+		copyBufPool.Put(buf)
+		if err != nil {
 			p.Log.Error("写入响应体失败", "req_id", reqID, "error", err)
 		}
 		return
diff --git a/internal/proxy/url.go b/internal/proxy/url.go
index e68c3bd..89f35f9 100644
--- a/internal/proxy/url.go
+++ b/internal/proxy/url.go
@@ -38,14 +38,17 @@ func BuildFromProtocol(protocol, remainder string, originalQuery url.Values) (st
 func mergeQuery(raw string, original url.Values) (string, error) {
 	parsed, err := url.Parse(raw)
 	if err != nil { return "", err }
+	if parsed.Scheme != "http" && parsed.Scheme != "https" {
+		return "", errors.New("不支持的协议")
+	}
+	if parsed.Host == "" {
+		return "", errors.New("目标地址无效")
+	}
 	// 合并 query
 	q := parsed.Query()
 	for k, vs := range original {
 		for _, v := range vs { q.Add(k, v) }
 	}
 	parsed.RawQuery = q.Encode()
-	if _, err := url.ParseRequestURI(parsed.String()); err != nil {
-		return "", err
-	}
 	return parsed.String(), nil
 }
diff --git a/main.go b/main.go
index e65cc5b..61310ab 100644
--- a/main.go
+++ b/main.go
@@ -50,8 +50,16 @@ func main() {
 
 	if cfg.Debug || lvlStr == "debug" { gin.SetMode(gin.DebugMode) } else { gin.SetMode(gin.ReleaseMode) }
 
-	// 可复用的 HTTP 客户端（保持连接复用）
-	transport := &http.Transport{Proxy: http.ProxyFromEnvironment, DisableCompression: true}
+	// 可复用的 HTTP 客户端
+	transport := &http.Transport{
+		Proxy:                 http.ProxyFromEnvironment,
+		ForceAttemptHTTP2:     true,
+		MaxIdleConns:          512,
+		MaxIdleConnsPerHost:   128,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+	}
 	client := &http.Client{Transport: transport}
 	if cfg.RequestTimeout > 0 { client.Timeout = time.Duration(cfg.RequestTimeout) * time.Second }