diff --git a/.gitignore b/.gitignore
index 9033da3..914d6e6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -33,7 +33,6 @@ data/metrics/metrics.json
 data/metrics/path_stats.json
 data/metrics/referer_stats.json
 data/metrics/status_codes.json
-data/config.example.json
 data/config.json
 .env
 data/cache
diff --git a/data/config.example.json b/data/config.example.json
new file mode 100644
index 0000000..e780c8e
--- /dev/null
+++ b/data/config.example.json
@@ -0,0 +1,61 @@
+{
+  "MAP": {
+    "/path1": {
+      "DefaultTarget": "https://path1.com/path/path/path",
+      "ExtensionMap": [
+        {
+          "Extensions": "jpg,png,avif",
+          "Target": "https://path1-img.com/path/path/path",
+          "SizeThreshold": 204800,
+          "MaxSize": 5242880
+        },
+        {
+          "Extensions": "mp4,webm",
+          "Target": "https://path1-video.com/path/path/path",
+          "SizeThreshold": 204800,
+          "MaxSize": 5242880
+        },
+        {
+          "Extensions": "*",
+          "Target": "https://path1-wildcard.com/path/path/path",
+          "SizeThreshold": 204800,
+          "MaxSize": 5242880
+        }
+      ]
+    },
+    "/path2": "https://path2.com",
+    "/path3": {
+      "DefaultTarget": "https://path3.com",
+      "ExtensionMap": [
+        {
+          "Extensions": "*",
+          "Target": "https://path3-wildcard.com",
+          "SizeThreshold": 512000,
+          "MaxSize": 10485760
+        }
+      ],
+      "SizeThreshold": 512000
+    },
+    "/wildcard-no-limits": {
+      "DefaultTarget": "https://default.example.com",
+      "ExtensionMap": [
+        {
+          "Extensions": "*",
+          "Target": "https://unlimited.example.com",
+          "SizeThreshold": 0,
+          "MaxSize": 0
+        }
+      ]
+    }
+  },
+  "Compression": {
+    "Gzip": {
+      "Enabled": false,
+      "Level": 6
+    },
+    "Brotli": {
+      "Enabled": false,
+      "Level": 4
+    }
+  }
+}
\ No newline at end of file
diff --git a/internal/config/config.go b/internal/config/config.go
index ac0fecf..5057d4c 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -41,8 +41,9 @@ func NewConfigManager(configPath string) (*ConfigManager, error) {
 	}
 
 	// 确保所有路径配置的扩展名规则都已更新
-	for _, pathConfig := range config.MAP {
-		pathConfig.ProcessExtensionMap()
+	for path, pc := range config.MAP {
+		pc.ProcessExtensionMap()
+		config.MAP[path] = pc // 更新回原始map
 	}
 
 	cm.config.Store(config)
@@ -131,8 +132,9 @@ func RegisterUpdateCallback(callback func(*Config)) {
 // TriggerCallbacks 触发所有回调
 func TriggerCallbacks(cfg *Config) {
 	// 确保所有路径配置的扩展名规则都已更新
-	for _, pathConfig := range cfg.MAP {
-		pathConfig.ProcessExtensionMap()
+	for path, pc := range cfg.MAP {
+		pc.ProcessExtensionMap()
+		cfg.MAP[path] = pc // 更新回原始map
 	}
 
 	callbackMutex.RLock()
@@ -151,8 +153,9 @@ func (c *configImpl) Update(newConfig *Config) {
 	defer c.Unlock()
 
 	// 确保所有路径配置的扩展名规则都已更新
-	for _, pathConfig := range newConfig.MAP {
-		pathConfig.ProcessExtensionMap()
+	for path, pc := range newConfig.MAP {
+		pc.ProcessExtensionMap()
+		newConfig.MAP[path] = pc // 更新回原始map
 	}
 
 	// 更新配置
@@ -191,8 +194,9 @@ func (cm *ConfigManager) loadConfig() error {
 	}
 
 	// 确保所有路径配置的扩展名规则都已更新
-	for _, pathConfig := range config.MAP {
-		pathConfig.ProcessExtensionMap()
+	for path, pc := range config.MAP {
+		pc.ProcessExtensionMap()
+		config.MAP[path] = pc // 更新回原始map
 	}
 
 	cm.config.Store(config)
diff --git a/internal/handler/proxy.go b/internal/handler/proxy.go
index 3573235..6e468ca 100644
--- a/internal/handler/proxy.go
+++ b/internal/handler/proxy.go
@@ -179,11 +179,7 @@ func NewProxyHandler(cfg *config.Config) *ProxyHandler {
 
 	// 注册配置更新回调
 	config.RegisterUpdateCallback(func(newCfg *config.Config) {
-		// 确保所有路径配置的processedExtMap都已更新
-		for _, pathConfig := range newCfg.MAP {
-			pathConfig.ProcessExtensionMap()
-		}
-
+		// 注意：config包已经在回调触发前处理了所有ExtRules，这里无需再次处理
 		handler.pathMap = newCfg.MAP
 		handler.prefixTree.update(newCfg.MAP) // 更新前缀匹配树
 		handler.config = newCfg