diff --git a/adapters/dingtalk/src/message.ts b/adapters/dingtalk/src/message.ts
index 5197b287..ae097641 100644
--- a/adapters/dingtalk/src/message.ts
+++ b/adapters/dingtalk/src/message.ts
@@ -92,6 +92,10 @@ export class DingtalkMessageEncoder extends MessageEncoder<DingtalkBot> {
       // await this.sendMessage('sampleImageMsg', {
       //   photoURL: attrs.url
       // })
+      if (this.bot.ctx.http.isPrivate(attrs.url)) {
+        throw new Error(`Send ${type} failed, please use public url.`)
+        // this.buffer += `![${attrs.alt}](https://static.dingtalk.com/media/${media_id}_${width}_${height}.jpg)`
+      }
       this.buffer += `![${attrs.alt}](${attrs.url})`
     } else if (type === 'message') {
       await this.flush()
diff --git a/adapters/line/src/message.ts b/adapters/line/src/message.ts
index 8f4f5ba2..ad9d4a5f 100644
--- a/adapters/line/src/message.ts
+++ b/adapters/line/src/message.ts
@@ -45,6 +45,10 @@ export class LineMessageEncoder extends MessageEncoder<LineBot> {
   async visit(element: h) {
     const { type, attrs, children } = element
 
+    if (attrs.url && ['image', 'video', 'audio'].includes(type)) {
+      throw new Error(`Send ${type} failed, please use public url.`)
+    }
+
     if (type === 'text') {
       this.buffer += attrs.content
     } else if (type === 'image' && attrs.url) {