diff --git a/packages/mitmproxy/src/lib/interceptor/impl/res/responseReplace.js b/packages/mitmproxy/src/lib/interceptor/impl/res/responseReplace.js
index 559c8be..05b9f4c 100644
--- a/packages/mitmproxy/src/lib/interceptor/impl/res/responseReplace.js
+++ b/packages/mitmproxy/src/lib/interceptor/impl/res/responseReplace.js
@@ -92,9 +92,9 @@ module.exports = {
       // 如果未手动配置需要缓存，则不允许使用缓存
       const maxAge = cacheReq.getMaxAge(interceptOpt)
       if (maxAge == null || maxAge <= 0) {
-        replaceHeaders['cache-control'] = '[remove]'
-        replaceHeaders['last-modified'] = '[remove]'
-        replaceHeaders.expires = '[remove]'
+        replaceHeaders['cache-control'] = REMOVE
+        replaceHeaders['last-modified'] = REMOVE
+        replaceHeaders.expires = REMOVE
       }
 
       actions += `${actions ? ',' : ''}download:${filename}`
diff --git a/packages/mitmproxy/src/utils/util.match.js b/packages/mitmproxy/src/utils/util.match.js
index 46bf246..4dae077 100644
--- a/packages/mitmproxy/src/utils/util.match.js
+++ b/packages/mitmproxy/src/utils/util.match.js
@@ -1,5 +1,6 @@
 const lodash = require('lodash')
 const log = require('./util.log.server')
+const mergeApi = require('@docmirror/dev-sidecar/src/merge')
 
 function isMatched (url, regexp) {
   if (regexp === '.*' || regexp === '*' || regexp === 'true' || regexp === true) {
@@ -113,16 +114,6 @@ function merge (oldObj, newObj) {
     }
   })
 }
-function deleteNullItems (target) {
-  lodash.forEach(target, (item, key) => {
-    if (item == null || item === '[delete]') {
-      delete target[key]
-    }
-    if (lodash.isObject(item)) {
-      deleteNullItems(item)
-    }
-  })
-}
 
 function matchHostnameAll (hostMap, hostname, action) {
   // log.debug('matchHostname-all:', action, hostMap)
@@ -178,7 +169,7 @@ function matchHostnameAll (hostMap, hostname, action) {
   }
 
   if (!lodash.isEmpty(values)) {
-    deleteNullItems(values)
+    mergeApi.deleteNullItems(values)
     log.info(`matchHostname-all: ${action}: '${hostname}':`, JSON.stringify(values))
     return values
   } else {