refactor(internal): improve logging and byte format in proxy handlers

internal/handler/proxy.go

@@ -128,13 +128,6 @@ func (h *ProxyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 	defer resp.Body.Close()
 
-	// 设置正确的 Content-Type
-	if strings.HasSuffix(strings.ToLower(decodedPath), ".mp4") {
-		w.Header().Set("Content-Type", "video/mp4")
-	} else if ct := resp.Header.Get("Content-Type"); ct != "" {
-		w.Header().Set("Content-Type", ct)
-	}
-
 	copyHeader(w.Header(), resp.Header)
 
 	// 设置响应状态码
@@ -172,9 +165,9 @@ func (h *ProxyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// 记录访问日志
-	log.Printf("[%s] %s %s -> %s -> %d (%d bytes) [%v]",
+	log.Printf("[%s] %s %s -> %s -> %d (%s) [%v]",
 		getClientIP(r), r.Method, r.URL.Path, targetURL,
-		resp.StatusCode, bytesCopied, time.Since(startTime))
+		resp.StatusCode, formatBytes(bytesCopied), time.Since(startTime))
 }
 
 func copyHeader(dst, src http.Header) {
@@ -197,3 +190,19 @@ func getClientIP(r *http.Request) string {
 	}
 	return r.RemoteAddr
 }
+
+func formatBytes(bytes int64) string {
+	const (
+		MB = 1024 * 1024
+		KB = 1024
+	)
+
+	switch {
+	case bytes >= MB:
+		return fmt.Sprintf("%.2f MB", float64(bytes)/MB)
+	case bytes >= KB:
+		return fmt.Sprintf("%.2f KB", float64(bytes)/KB)
+	default:
+		return fmt.Sprintf("%d Bytes", bytes)
+	}
+}

internal/middleware/fixed_path_proxy.go

@@ -1,12 +1,16 @@
 package middleware
 
 import (
+	"errors"
+	"fmt"
 	"io"
 	"log"
 	"net"
 	"net/http"
 	"proxy-go/internal/config"
 	"strings"
+	"syscall"
+	"time"
 )
 
 type FixedPathConfig struct {
@@ -18,6 +22,7 @@ type FixedPathConfig struct {
 func FixedPathProxyMiddleware(configs []config.FixedPathConfig) func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			startTime := time.Now() // 添加时间记录
 			// 检查是否匹配任何固定路径
 			for _, cfg := range configs {
 				if strings.HasPrefix(r.URL.Path, cfg.Path) {
@@ -28,6 +33,8 @@ func FixedPathProxyMiddleware(configs []config.FixedPathConfig) func(http.Handle
 					proxyReq, err := http.NewRequest(r.Method, targetURL, r.Body)
 					if err != nil {
 						http.Error(w, "Error creating proxy request", http.StatusInternalServerError)
+						log.Printf("[%s] %s %s -> 500 (error creating request: %v) [%v]",
+							getClientIP(r), r.Method, r.URL.Path, err, time.Since(startTime))
 						return
 					}
 
@@ -49,6 +56,8 @@ func FixedPathProxyMiddleware(configs []config.FixedPathConfig) func(http.Handle
 					resp, err := client.Do(proxyReq)
 					if err != nil {
 						http.Error(w, "Error forwarding request", http.StatusBadGateway)
+						log.Printf("[%s] %s %s -> 502 (proxy error: %v) [%v]",
+							getClientIP(r), r.Method, r.URL.Path, err, time.Since(startTime))
 						return
 					}
 					defer resp.Body.Close()
@@ -64,10 +73,16 @@ func FixedPathProxyMiddleware(configs []config.FixedPathConfig) func(http.Handle
 					w.WriteHeader(resp.StatusCode)
 
 					// 复制响应体
-					if _, err := io.Copy(w, resp.Body); err != nil {
-						// 已经发送了响应头，只能记录错误
-						log.Printf("Error copying response: %v", err)
+					bytesCopied, err := io.Copy(w, resp.Body)
+					if err := handleCopyError(err); err != nil {
+						log.Printf("[%s] Error copying response: %v", getClientIP(r), err)
 					}
+
+					// 记录成功的请求
+					log.Printf("[%s] %s %s -> %s -> %d (%s) [%v]",
+						getClientIP(r), r.Method, r.URL.Path, targetURL,
+						resp.StatusCode, formatBytes(bytesCopied), time.Since(startTime))
+
 					return
 				}
 			}
@@ -91,3 +106,36 @@ func getClientIP(r *http.Request) string {
 	}
 	return r.RemoteAddr
 }
+
+func handleCopyError(err error) error {
+	if err == nil {
+		return nil
+	}
+
+	// 忽略常见的连接关闭错误
+	if errors.Is(err, syscall.EPIPE) || // broken pipe
+		errors.Is(err, syscall.ECONNRESET) || // connection reset by peer
+		strings.Contains(err.Error(), "broken pipe") ||
+		strings.Contains(err.Error(), "connection reset by peer") {
+		return nil
+	}
+
+	return err
+}
+
+// formatBytes 将字节数转换为可读的格式（MB/KB/Bytes）
+func formatBytes(bytes int64) string {
+	const (
+		MB = 1024 * 1024
+		KB = 1024
+	)
+
+	switch {
+	case bytes >= MB:
+		return fmt.Sprintf("%.2f MB", float64(bytes)/MB)
+	case bytes >= KB:
+		return fmt.Sprintf("%.2f KB", float64(bytes)/KB)
+	default:
+		return fmt.Sprintf("%d Bytes", bytes)
+	}
+}